Change read_sd_file semantics to return size read.

Fusee: Fix BisPartition enum to correctly identify partitions. ...

* BisPartition_t was missing SAFE, meaning User and System were using wrong key_source

* Normalize tabs to spaces

* Merge User and System BisPartition_t because they are the same key anyway

* Remove extra newline

Fusee: Fix overflow condition in SD KIP merging

Fusee: Update INI1 size after patching

Fusee: Actually write SD path in stratosphere_merge_inis

Stratosphere: Add support for custom KIPs/INI in Fusee

Fusee Stage 2: Flesh out Package2 patching (implement decryption, fixing of metadata)

Skeleton out framework for patching package2.

Fusee Stage2: skeleton more of the nxboot process

Add skeleton architecture for displaying custom splash screen

Restore incorrectly deleted files

Fusee Stage 2: Make references to external (stage 1) memory internal.

Fusee stage 2: Fix up loader (no stage 3!). Skeleton chainload behavior.

Turns out we actually don't need a third stage for Fusee

Update argument passing, add video resume

Implement much of the core Stage2 loader logic for Fusee

Use argc/argv in Stage 2

Add display/printk to fusee stage2

Fix start.s in stage2 of Fusee for argc/argv

Implement all core Stage 1 logic for Fusee

Change fusee folder naming