reprap discount panel working in character mode.
Only has 16 character lines though.
switch to graphic fonts
make 20x8 screen
update config
optimize panel to display lines not characters
fix startup screen
optimize glcd
only refresh framebuffer if it is dirty
cap speed override to not less than 1%
sync watch screen with speed override changed via M220
chane speed changes via panel to issue M220 to avoid skipping issues
clean up gcode sending and rename command sending

Conflicts:

	src/modules/utils/panel/screens/WatchScreen.cpp
Merge pull request #204 from wolfmanjm/feature/rrd-glcd

Feature/rrd glcd