* Add s-expression Format() function to all objects derived from
BOARD_ITEM.
* Add s-expression Format() function to base objects as required.
* Add functions to convert coordinates from base internal units
(nanometers) to millimeter string for writing to s-expression
file.
* Add temporary dummy conversion functions to prevent link errors
until schematic and board object and action code can be separated
into DSO/DLL.
* Add CMake build option to build Pcbnew with nanometer internal
units.
Remove or move old .ico and .pgn files and add new icons (.ico files and .png files) in bitmaps_png/icons and bitmaps_xpm/icons
.png files and .ico are used to build desktop shortcuts
Handle variable size bitmaps in kicad.
Wayne Stambaugh
Dick Hollenbeck
jean-pierre charras
Andrey Fedorushkov
Marco Serantoni