dyncom: Minor changes

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.

csnd_snd: Get rid of type punning

Refactor ScanDirectoryTreeAndCallback to separate errors and retvals

ScanDirectoryTreeAndCallback, before this change, coupled error/return
codes and actual return values (number of entries found). This caused
confusion and difficulty interpreting the precise way the function
worked.

Supersedes, and closes #1255.

renderer_opengl: Fix uniform issues with #1253

Use regular uniform location

The support for GL_ARB_explicit_uniform_location is not that good
(53% according to http://feedback.wildfiregames.com/report/opengl/feature/GL_ARB_explicit_uniform_location).

This fix the shader compilation on Intel HD 4000 (#1222).

Add stub functions for Initialize and GenerateRandomData in ssl:C

Followup to #1102
Original author @mailwl