* Added modified CMake FindPython... modules to support using Python-a-mingw-us distribution when building Windows scripting support using MinGW

fix interface mapping slip-up in wxPoint EDA_DRAW_FRAME::GetCrossHairPosition( bool aInvertY ) const

Save grid origin in .kicad_pcb files only if not 0,0 (to keep compatibility with previous versions of pcbnew, mainly the stable version)
Very minor other fixes (set modify flag when grid origin is moved from the dialog grid)

split expression into two lines for verification while using debugger that GetScreen() is a virtualized call.

*) add hotkey for setting the grid origin as 'S', in board editor, module editor.
*) re-position the function interface for cursor movement from BASE_SCREEN into
   class EDA_DRAW_FRAME.  This is a prelude to getting rid of BASE_SCREEN or
   splitting it up.

Now it is more verbose and the status is checked at the right moment (previously it was fine with Linux, but on Windows it showed errors).

Minor fixes. Minor code cleaning. Pcbnew: better iniatilization of members in DRAWSEGMENT, TRACK, EDGE_MOD (not bugs: just useful when using python scripting).

Minor code cleaning. Pcbnew: better iniatilization of members in DRAWSEGMENT, TRACK, EDGE_MOD (useful when using  python scripting).

convert to UTF-8, eeschema cannot load LATIN1 strings anymore.

All source files are supposed to be UTF-8 now.  Although not a source file, my editor
was tripping on this file when grepping.