Cleaning 3 svg files (no icon change)
Very minor other changes.

* Remove obsolete settings from Doxygen configuration file.
* Fix some Doxygen warnings.
* Add the board edge segment snapping to developers road map.
* Fix some coding style issues in CMakeLists.txt

Handles % macro expansion in user texts inside pcb modules.
At the moment the following are available:
%%      A plain %
%R      Insert the reference
%V      Insert the value

* Compile all binaries into a single application bundle.
* Use CMake BundleUtilities to make application bundle relocatable.
* Restructure build output to directly create an image file.
* Fix default search paths.
* Set KIGITHUB environment variable.
* Added patch to fix wxWidgets so names for OSX.

BOARD::Add(): fix an issue for tracks: parent not set (could be an issue only in python scripts, because the parent is set by the constructor)
*.i : fix coding style issues.
python method: add BOARD_ITEM Duplicate, which is a wrapper to Clone(). ( defined as Cast_to_BOARD_ITEM(selt.Clone()).Cast() )
update some .py examples.

Pcbnew: fix some issues when using python scripting (remove outdated SEG_ZONE item, fix broken access to netclass, track width and via size lists, add missing access to zones)
Update listPcb.py to show how to access zones.

Also update main toolbar track width and via size info in pns router mode, when starting a track, and other very minor update issue.

change name TEXTE_MODULE::MirrorWithModule to TEXTE_MODULE::MirrorTransformWithModule, because it is a function specific  to a footprint transform in modedit.
change also name TEXTE_MODULE::RotateWithModule to TEXTE_MODULE::RotateTransformWithModule for same reason.
Pcbnew: fix Bug #1374484 (text changes position when module is flipped and rotated). Fix also some bugs in modedit, in block commands.

Pcbnew: fix Bug #1373468 (Non Copper Zones Properties  dialog "Layer selection" empty) (Linux specific)

Pcbnew: add append board function, only available when Pcbnew is run in standalone mode (outside a project), to allow a basic panelization.
(this function is not compatible with a project, because it breaks the coherency with the schematic)

Minor other fixes.

Minor fixes: specctra export: skip malformed circles (having a radius = 0)  in board outline creation, which can crash 3d-viewer or vrml export.
dialog_fp_lib_table: remember during a session the last open table (global or local).
drawing_tool: fix compil warning
Update demos.

* Set wxGrid tab behavior to leave grid when using the tab key.
* Lots of coding policy fixes.

IO_MGR::PCB_FILE_T IO_MGR::GuessPluginTypeFromLibPath() : better test for KICAD type footprint libraries: previoulsy, just test if a library name ends with .pretty, which is not enough.
GitHub lib names also ends  by .pretty, so also test if a lib name does not start by http (which could be a GitHub lib name).

Eeschema: back to KICAD_KEEPCASE option, to find parts in lib, when using case sensitive option (default).
Schematic component properties dialog: add 2 helper buttons to manage the chip name (name of the corresponding part in lib)
- a browse button to chose an other chip name
- a test button, to know if the part exists. If not existing, list the parts found when searching using a case insensitive comparison.

Patch for the Python footprint wizard helpers. This adds a few more drawing functions, such as for circles, and also uses a matrix-based transform stack with greatly simplifies constructing footprints consisting of regularly spaced elements (e.g. in lines, grids, circles, or some list of points that you specify).
This fixes bug #1366299

Ref and Value for footprints: use now the layer color, not a specific color: this is needed by the fact these fields can be on an other layer than silk screen, and therefore must have the corresponding color
Also do not allow copper layers, solder paste and solder mask: put Ref or Value on these layers has no sense, and can create serious issues on the board.

Factored out text ellipsing support to max 15 character (for generating menu items)

Since reference and value are not anymore always on silk changed the label on the corresponding options in the plot dialog
The 'proper Gerber extensions' was renamed in dialog as 'Protel Gerberl extensions': I don't know if it was a typo/misunderstanding or what but the proper extension is gbr; the set of alternative extensions seems to be the one used by Protel/Altium.

The members SetIgnoreMTextsOnCopper, SetIgnoreMTextsOnCmp,
SetIgnoreModulesOnCu, SetIgnoreModulesOnCmp in the collector guide are
renamed to the clearer SetIgnoreMTextsOnBack, SetIgnoreMTextsOnFront,
SetIgnoreModulesOnBack, SetIgnoreModulesOnFront

Modified the collector and drawing behaviour for text in modules as
discussed in the mailing list.

* Now module text on layers different than Silk should work! *

Still need UI support for setting the layer in the module editor.

- Removed the friends MODULE and FOOTPRINT_EDIT_FRAME from TEXTE_MODULE
  (as in the @todo comment)

- Refactored the Rotate/Flip/Mirror for text in modules into the
  TEXTE_MODULE class itself (members RotateWithModule, FlipWithModule,
  MirrorWithModule)

- New behaviour in coloring text on screen: reference and value still
  take the color from the MOD_TEXT_FR_VISIBLE and MOD_TEXT_BK_VISIBLE
  visibles; other text takes the color of the layer containing it
  (except when hidden, obviously) but still get its visibility
  controlled by those visibles (probably the most intuitive and useful
  behaviour)

- Still need to decide: should text on a layer be hidden when the layer
  is? Probably yes (still to be implemented);

- Some comment fixed and many cast converted to static_cast

Remove a minor compil warning in shape_collisions.cpp

- Reference is visible on silk and the corresponding assembly layer
- Reference is shown on assembly always on the component insertion point

Hidden references are not forced shown in assembly plots (there is
already a user option for that)

Kicad:  more understandable dialog when creating a project from template. Fix also a bug when copying and renaming template files.
Pcbnew: dialog to create new .pretty lib: fix an issue which prevent to open a full disk directory (at least on Windows)

* Create GetNewConfig() and GetKicadConfigPath() to unify configuration file
  creation and location.
* Move Windows configuration out of the registry into configuration files.
* Move Linux configuration files from $HOME to $HOME/.config/kicad to eliminate
  configuration file pollution in the users $HOME folder.
* Fix a bug in the configuration file where the Eeschema hot keys are saved.