15 : Build 2565

IMP: Added ESC option to serial link to break out.
IMP: Completed turtle graphics
IMP: Tilemap Graphics can overlap the screen edges
IMP: Added keyboard support for ALT + ALTGR to emulator (framework/gfx)
IMP: Extracted locale code to a new file.
IMP: Added new Locale code
IMP: Added German keyboard file
BUG: CLS now clears the graphics screen but not the sprites if present
BUG: SPRITE CLEAR clears the sprites only
BUG: CLEAR now resets the sprites and clears the sprite layer, which makes them consistent.
IMP: TURTLE CLEAR is now TURTLE HOME
IMP: Added SPOINT() to read sprite layer.