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

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

silent warning C4146 on msvc

Enable RTTI on Windows builds.

gdbstub implementation

GPU/Loaders: Log an error when a loader tries to load from a component beyond the available ones

GPU/Loaders: Log an error when a loader tries to load from a component beyond the available ones (12).

Related to #1170

pkgbuild is now provided by Travis itself, so homebrew throws
an error upon trying to install it.

CMake recently 302'd the download URL we're using.
To prevent any issues, just follow the redirect with cURL.

Added CSND_ExecuteType0Commands stub.

Implement FS_User::GetFreeBytes

Add GetTotalStepCount Stub