- 16-bit attribs
- added attribs FG and BG, if not set, default colors
- added attrib INVERT, removed server-side color flipping
- added screen attrib REVERSE_VIDEO (can't be done server-side if we want it to work with off-scale colors)
- changed Attribs encoding to 3B
- removed old migrations, made useless by the flash wipe caused by adding Admin PW section
- some cleaning in CSI parser
- removed function to set SGR inverse separately (now use normal SGR setter)
- added functions to set fg and bg to defaults
Ondřej Hruška