Driver for T6963 (RA6963) monochrome disp

[doc_rob]

During my work with the KS0108 driver i ordered another display to test the driver more extensively. I later found out that the display used a different chip - the RA6963. I had to write a new driver. I took all the advice of the uGFX team i got from the KS0108 driver and did the best i could. Here is the result:

gdisp_lld_config.h

gdisp_lld_RA6963.c

board_RA6963.h

[Joel Bodenmann]

That looks very good, well done! I added it to the repository.