app_server: adjust Freetype dependency.

* added DrawingContext.cpp and ServerCursor.cpp
scsi_periph: check block_size against zero in io().

* should help with #10466
Pairs: Style fixes and update copyright headers.

Update long description in rdef
Pairs: update version number to 0.9-gamma
Pairs: store vector icons, new size menu

* Search for vector icons from MIME database once at start,
  limit to application super-type, this fulfills a TODO in the code
* Use a std::map keyed by a hash to avoid duplicate icons
  eliminating _HasBitmap()
* Store the vector representation and then only build bitmaps
  when needed
* Convert uses of int to int32
* Convert from using BList to BObjectList, simplified cleanup
* Rename variables and methods to not abbreviate/be more clear
  e.g. fPosX, fPosY => fPositionX, fPositionY
  e.g. _GenerateCardPos() => _GenerateCardPositions()
* Renamed PairsTopButton to PairsButton
* Integrate Size submenu into New menu item.
  Size menu item goes away, you can select New to get a new game at
  the current difficulty, or, you can drill down in the New menu to
  choose from Beginner, Intermediate, or Expert.
* Add new Size menu to set the icon size: Small (32x32), Medium (64x64),
  or Large (128x128). Default is medium
* Rename MENU_SIZE message constant to MENU_DIFFICULTY for clarity
* Eliminate PairsGlobal.h, distribute constants to appropriate files.