* explanation for CP437 glyph groups
* translation for MonnModules symbol
* "smiley" replacement for 4-bytes and overlong unicode codes
* always compile unicodetool.cpp (codepage translation still depends on WLED_ENABLE_UNICODE)
* bugfix: DrawString now skips over glyphs that would be rejected by DrawCharacter
* minor cleanup
part1:
* enable all bitmaps already defined in the font files (increases firmware by ~7KB)
* add traslation for unicode -> codepage437 (as used by font files)