ChibiOS Free Embedded RTOS

Finally, I've got it!
I still haven't tested all of the features nor documented all of the code yet, but this is already more than enough for now

@ Tectu: I'll send you a pull request from my forked SDRAM demo (SDRAM not used anyway), with the current LTDC driver and a few fixes.

Code uploaded to my forked repository:
https://github.com/TexZK/ChibiOS-RT-Community/tree/ltdc

The LTDC API is now refactored, for clarity and performance purposes. Register reloading is now asynchronous.
The new API is modeled on that of SPI driver, including mutual exclusion, asynchronous call management, and other stuff, so that ts is more "ChibiOS-compliant".