Add a workaround to fix a new bug in wxWidgets 3.0 ( Windows specific ) which shows icons only with a size = 16x16 in menus which have attribute wxITEM_CHECK

Fix some incorrect icons (which were using a not supported font for texts). Add ps_router icon from Konstantin Baranovskiy.

Add missing calls to Show( false ) to some main frames (Kicad, eeschema, gerbview), to force config saving when closing these windows.
Code cleanup and minor coding style fixes  in footprint_wizard_frame

* Add third list control with library names.
* Add button to toolbar to select filter by library name.
* Add bitmap for filter by library name toolbar button.
* Remove custom UI colors from list controls.

Eeschema: fix broken  mirroring for texts and labels in block mirror X and Y (this fixes Bug #1135505)
Pcbnew: add in module popup menu an option to edit the footprint in Modedit (like in Eeschema for components)
minor icons enhancements.

Because now there are 2 formats, board backup files extensions are .brd-bak or .kicad_pcb-bak instead of the old .000 extension, depending on the initial file format.

Also a minor cosmetic enhancement

Kicad manager: shows now svg files in tree files.
Pcbnew: fix incorrect printing (board out of page) when creating drill map in postscript format ( noticeable mainly for small boards)

  *  serious code cleanup (remove duplicate code)
  *  shows (option in 3D preference menu) the copper items (tracks, zones...)  in 3D, using 35 microns copper thickness.
      However, because there are a lot more3D data to show (roughly 4 times more), this is slower.

All: press ctrl+shift key when moving the mouse allows the graphic cursor to be moved outside the grid.
(useful to place graphic objects, texts in any position, regardless the current grid)

This is *a work in progress*, so some features are missing, and/or could be modified.
Mainly keepout zones are not yet exported to autorouters, and pads are not taken in account.
Some code cleanup in polygon.*

* Footprint wizard C++ generic classes
* Footprint wizard C++ to python wrappers 
* Automatic plugin loader from ~/.kicad/plugins
* Python plugin architecture: Footprint wizards

Eeschema: one string with a bad char (\a, not useable in internationalized strings).
Dialog_page_settings: use not translated strings in code, so strings can be freely translated for the UI.
(Initial code was not working with existing translations)
Update 2 icons.

Remove 2 duplicate icons.
Minor cosmetic enhancements and fixes in popup menus.

Eeschema: fix a bug in bool SCH_LINE::MergeOverlap( SCH_LINE* aLine ): ends point of resulting segment incorrects.
remove unused icon files.

* make 2 bitmaps more visible.
* fix incorrect screen redraw when rotating a component.
* netlist : the pcbnew advanced format can be now stored (persistant option) in project config.

 * Added a dialog to select options: one or 2 files, units (mm or inch), and force INSERT option.
 * code cleaning
 * Modify corresponding  icon in menu to show a footprint, not a schematic component.

Icons for modedit and modview: remove unused or duplicate icons files and rename files. Tweak some icons.

Also commit updated icnos from Fabrizio.

Fix bug 910364: When a footprint saved in a .mod file is not on front layer and/or not with orientation 0 degree, the Module editor load it incorrectly.
note:  the Module editor save it with default orientation and layer, but the archive function does not, so some footprints can be not editable.
TODO: modify the Archive Function to use the default layer / orientation.

Minor other enhancements and code cleaning.