arm: General cleanup

- Remove several typedefs for ARMul_State.
- Remove unused functions
- Remove unused/unnecessary headers
- Removed unused enums, etc.

Dyncom: Correctly set the ARM modes on dyncom initialization.

backend: Add logging subentry for ldr

Some function calls aren't necessary and would be handled by regular initialization routines.

Fixes an assertion upon executing citra in debug mode.

dyncom: Remove warning for SXTAH

This is tested to work correctly.

Fix Min and Max blend equations

More ARM cleanup

This was only used for armemu, which has since been removed. Removed components related to this as well.

armdefs: Remove unnecessary extern C

Update ext-boost commit again which got reverted by #500

Vertex shader debugger

Implemented WriteHWRegsWithMask for GSP

arm: Remove ARM26 support.

This will never be used. 32-bit is the norm.

arm: Some cleanup. Also fixed the initial ARM mode that is emulated.

Initially, we were starting the emulator in USER26MODE, which is incorrect, this should be USER32MODE.

Made asserts actually break the debugger, or crash if the program is not in debug mode.

Involves making asserts use printf instead of the log functions (log functions are asynchronous and, as such, the log won't be printed in time)
As such, the log type argument was removed (printf obviously can't use it, and it's made obsolete by the file and line printing)

Also removed some GEKKO cruft.

GSP SetBufferSwap fix

Services: Stub some functions

arm: Remove TRUE/FALSE defines

arm_dyncom_thumb: Make lookup tables static

FS: Allow multiple instances of the same archive type to be open at once

- Removed the Debug parameter from ARMul_State since it isn't used.
- Changed ARMul_CoProInit to a void function. It always returned true.