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

exo: fix SAVE_WP_REG definition

exosphere: commit WIP warmboot progress ...

-15+ bugs fixed
-We now receive ~0x400 SMCs from user processes
 (including from psm) on wake-from-sleep

[exosphere] Rewrite crt0/init and ld script

Add spsr_el3 to cpu_context

Fix flow controller set functions

Add most of warmboot_main

Fix bugs required to successfully hand off to kernel

Use the boot critical section

Implement CPU state init, fix bug in cpu_context restore

Finish bootup_misc_mmio() - Cur build gets to end of pk2ldr.

Finish writing coldboot_main

Refactor save/restore_current_core_context, fix memory ordering issue with inline asm

Finish smcCpuOff

Uncomment more sleep/suspend code

Implement save/restore current core context

Rename cache.s/.h to arm.s/.h

Skeleton smcCpuOff, fix building, fix smcConfigureCarveout

Rename set_core_entrypoint_and_context_id

Start implementing smcCpuSuspend

all: Make file-scope variables internally linked where applicable (#57) ...

Narrows the scope of visible symbols to where they're actually used. Also
makes it easier to see true globals in source files
(ones used from multiple translation units)

Move source files to src/, add Makefile, fix all build and linkage errors, etc.