swrasterizer: Add missing override specifier

SVC: Fixed ArbitrateAddress to behave as it does on hardware.

dyncom: Handle modifying the APSR via an MRC instruction

This was verified with hwtests that i plan to upload later on.

svc: Remove superfluous printf argument

Add a return value in ForeachDirectoryEntry 

dyncom: Minor changes

ForeachDirectoryEntry is changed by #1256 ,but return value at last line
was missing.

These instructions aren't capable of using the PC as a destination

VideoCore: Sync state after changing rasterizers

This fixes various bugs that appear in the HW rasterizer after switching
between it and the SW one during emulation.

LDRT/LDRBT/STRBT/STRT should simulate the load or store
as if the host CPU is in user mode.

STRT is also allowed to use the PC as an operand

svc: Fix compilation with LOG_TRACE enabled

OpenGL: Flip framebuffers during transfer rather than when rendering

GPU/PrimitiveAssembler: Fixed drawing triangle fans.

VideoCore: Unify interface to OpenGL and SW rasterizers

This removes explicit checks sprinkled all over the codebase to instead
just have the SW rasterizer expose an implementation with no-ops for
most operations.

dyncom: Miscellaneous minor changes

It was skipping the second vertex assignment and using uninitialized garbage when assembling the corresponding triangle.

Services/Cam: Added new log type and camera enums from 3dbrew.

PICA: Properly emulate 1-stage delay in the combiner buffer

This was discovered and verified by @fincs. The tev combiner buffer
actually lags behind by one stage, meaning stage 1 reads the initial
color, stage 2 reads stage 0's output, and so on.

Fixes character portraits in Fire Emblem: Awakening and world textures
in Zelda: ALBW. Closes #1140.

Kernel: Implement svcGetSystemInfo

This makes smealum/ctrulib@b96dd51d3349961189d4ab1bc2a5c45deff21c09 work
with Citra.

armstate: Zero out the registers on creation

std::array isn't always guaranteed to explicitly zero out it's contents
without an initializer list.

The VFP registers are 64 bits each, and there are 32 of them.