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

Fix read and write register blocks in gdbstub

Add Initialize and GenerateRandomData function names to ssl:C

Previously, the padding wasn't correctly accounted for which caused the gdbstub to read and write everything after R15 (starting with the dummy FPA registers) incorrectly, which caused CPSR to not be handled correctly. Everything appears to be working as expected with this change.

Shaders: Use UBOs instead of individual uniforms in the generated frag shaders

Common: silence Vec warnings on msvc