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Pcbnew: fix some issues when using python scripting (remove outdated SEG_ZONE item, fix broken access to netclass, track width and via size lists, add missing access to zones)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

Update clipper version to 6.1.3a.

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.

* Remove ${CMAKE_CURRENT_LIST_DIR} copied FindPackageHandleStandardArgs.cmake.
* Comment out debug messages in FindwxWidgets.cmake.

* Add version detection to FindwxWidgets.cmake
* Convert commands and macro names to lower case in FindwxWidgets.cmake.
* Use find_package_handle_standard_args() to handle version comparison.
* Update FindPackageHandleStandardArgs.cmake from CMake 3.0.2 to get the
  latest bug fixes.
* Add an option to ignore building every OSX dependency from source and
  use find_package() the way it is supposed to work unless the developer
  specifically requests building everything from source.

fix recent bug which prevent eeschema to save color preferences.
fix few other minor issues.

fix recent bug which prevent eeschema to save color preferences.
fix few other minor issues.

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.

Kicad manager: fix an issue when starting eeschema from its button: if the library editor was previously running, and if the quasimodal field editor dialog was called, eeschema did not start on Windows, or started but sometimes did not load the schematic project on Linux.
Enhancement : if a tool is running but is iconized, clicking on its button bring the window on screen. This was already the case on Linux, but on Windows, the iconized frame was staying iconized.

Kicad manager: fix an issue when starting eeschema from its button: if the library editor was previously running, and if the quasimodal field editor dialog was called, eeschema dis not start on Windows, or started but dis not load the schematic project on Linux.
Enhancement: if a tool is running but is iconized, clicking on its button bring the window on screen.

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

Eeschema: remove the compil option KICAD_KEEPCASE. Eeschema is now always case sensitive when seraching components in libs.
However to be compatible with old versions of Eeschema, when a search in library fails, a case insensitive search is made.
Therefore, this version should be compatible with sch files created by previous Eeschema versions compiled with KICAD_KEEPCASE = OFF

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)