Corrected a few small bugs/cleanup.

Port back changes from open_agb_firm. Now with proper screen init.

Updated PXI code/doc with new findings.

Don't disable vfp (no harm in leaving it on). Lots of small, mostly style changes.

PXI, IPC and debug code cleanup.

Some PXI code cleanup.

Reverted C++ header commit because it looks ugly. We will change this later.

Add missing C++ guards for C code.

Clear screens on screen init only if requested.

Completely deinit/init screens on sleep.

More checks. Allow setting different brightnesses for each screen.

Turn on backlight and LCDs at the same time. Correct touchscreen framebuffers on FIRM launch.

Implemented proper sleep mode.

Fixed some potential bugs the PVS Studio demo found.

Little cleanup.

Optimizations + fixes.

Cleaned up PXI code and fixed a few bugs.

Use same PXI source for ARM9 and ARM11.

Make PXI/IPC code safer.

Separate IPC and PXI code.

Refactored PXI code. Removed a lot of code on ARM9.

Implemented double buffering.

Implemented GFX_getFramebuffer().

Use a render buffer.

[GFX] Use defines for regs. Use macro for default brightness.

Move GUI sources in a separate gui folder and hardware sources in hardware folder episode 2.