preparing auto refresh of the 3D view in mod edit (not yet working)

* Implement code to allow wxDC to handle coordinate conversions between
  device and drawing units.
* Add build settings to enable wxGCDC for wxGraphicsContext testing.
* Remove wxAUI conditional build cruft as it is now required to build
  Kicad.
* Fix scroll increment size regression to prevent jumping around the
  zoom center position.
* Add find GDI+ cmake module for building on WXMSW when wxGraphicsContext
  is enabled.

removed global variables and a lot of redundancies

hide/show rastnest in pcbnew is currently not working, will be fixed soon

Better code in fast draw grid algo (drawpanel.cpp):must be faster, and minor refresh problems removed under wxGTK

Code cleaning.
Patch for 3D problem with macOSX

  * Moved ReturnLayerName() to static BOARD::GetDefaultLayerName() and migrated
    to a Specctra DSN compatible default layer naming scheme:
        Component becomes Front, Copper becomes Back.
  * set_color.h: Cmp becomes Front, Cu becomes Back.
  * D_PAD::DisplayInfo() changed to use actual copper layer names.
  * more layer setup dialog work, moved all programmatic wxControl instantiation
    into the wxFormbuilder environment, but this is fraught with danger:
    wxFlexGridSizer used the tallest control to establish the row heights, so
    be careful about changing control borders in the scroll panel. The vertical
    size can explode since just a couple of pixels times the number of rows
    is substantial.  Currently I am setting a 5 pixel border only left, top, and right
    but not bottom.
  * Set copper layer count is back in place as a hack until I can get the enabled
    layer bit map fully operational.

* Complete comment translation for all EESchema source files.
* Complete comment translation for all 3D viewer source files.
* Rename class class_hierarchical_PIN_sheet to SCH_SHEET_PIN.
* Rename class DrawSheetStruct to SCH_SHEET.
* Tool tip capitalization fixes.
* Uncrustify and spell check comments and strings in all modified source
  files.

* Split out application specific command IDs to prevent unnecessary rebuilding.
* Eliminate duplicate menu and tool bar command IDs.
* Split component library editor and viewer definitions to separate header files.
* More component library and document file merge code.
* A bunch of minor string readability and consistency fixes.

enhancement in Cvpcb: fast selection of components or footprint by typing the first letter of reference or footprint name

better compatibility with wxWidgets 2.9. Markers enhancement in pcbnew (right click can display marker info)

3D view: fixed: mirrored texts incorrectly drawn

Minor others changes.

* Created separate SVN version header.
* Add true config.h for platform dependency checks.
* Add dependency check cmake module.
* Remove some leftover hand crafted make files.
* Remove non-cmake build instructions from COMPILING.txt.
* Fix split _() strings causing Visual C++ compiler error.
* Fix lots of compiler warnings.
* Change project file parameter container from wxArray to boost::vector_ptr.
* Removed lots of redundant header definitions.
* Fixed green_xpm redefinition in ercgreen.xpm.
* Remove some dead code and unnecessary class methods.

* ALL: More changes for wxDC based zooming.
* 3D_VIEWER: Wrap 3d_viewer.h to prevent redefinitions.
* CVPcb: Replace wxList with boost::ptr_vector and take advantage of boost::foreach.
* CVPcb: Fix automatic association bug.
* CVPcb: Rename some variables for clarity and some minor code clean ups.
* CVPcb: Fix GTK sizing issue in library and path dialog.
* EESchema: Remove left over sizer from last commit from library and path dialog.