fusee: Improve integration with the new logging system ...

fusee: Implement log level configuration from BCT.ini

Add and fix copyright notices for better GPL compliance (thanks @naehrwert and @CTCaer).

Fusee: Deployed new SDMMC driver in fusee-secondary. All stages boot now. ...

Fusee: Fixed wrong argument in se.c function.
Fusee: Improved timers.

fusee: SDMMC driver re-design: ...

- Based on hekate's, linux's and u-boot's source code;
- Full support for SD and MMC;
- Fixes multiple issues;
- Deployed first in fusee-primary.

fusee: Code cleanup and style fixes.

Pass screen status and mmc struct from stage1 to 2

Fix stage2_args_t mismatch

Rewrote crt0, init, and chainloading code ...

start.s, init.c, linker.ld and linker.specs are meant
to be re-used by user applications, should they remove the defines
from init.c and the .chainloader* sections from the linker script

Don't pass the mmc struct around

Instead of passing FatFS structs around, unmount; other changes

Merge SD stuff into fusee-secondary. Switch diskio to single-sector reads temporarily

Update argument passing, add video resume

Implement much of the core Stage2 loader logic for Fusee

Implement all core Stage 1 logic for Fusee