citra-qt: Improve pica command list widget (add mask, fix some issues)

Shader debugger improvements

Renamed "Iteration index" to the (hopefully) more intuitive "Cycle Index".
Added flexible space at the bottom of the widget.

Introduce a shader tracer to allow inspection of input/output values for each processed instruction.

Now supports dumping the current shader and recognizes a larger number of output semantics.

Handle `FileType::CIA` in `switch` statements

citra-qt: save path for recent files loaded

vfp: use std::swap where applicable

Handle invalid `Log::Class`

Vertex Shader JIT for X86-64

- Config: Add an option for selecting to use shader JIT or interpreter.
- Qt: Add a menu option for enabling/disabling the shader JIT.

- Also renames "vertex_shader.*" to "shader_interpreter.*"

Make `Loader::LoadFile` return an `ErrorNotImplemented` if you call
it on a CIA file.

Make `GetFileTypeString` return ‘CIA’ for CIA (CTR Importable
Archive) files.

Add a case of `Log::Class::Count` to the switch statement that
dispatches on `Log::Class`.  The case simply calls the `UNREACHABLE`
macro.

debugger: Add the ability to view VFP register contents

Stop defining GCC always_inline attributes as __forceinline

__forceinline is a MSVC extension, which may confuse some people working on the codebase.
Furthermore, the C++ standard dictates that all names which contain adjacent underscores are reserved.

Replace standard uint*_t and int*_t with CommonTypes’ u* and s* types

ARM Core, Video Core, CitraQt, Citrace: Use CommonTypes types instead of the standard u?int*_t types.

OpenGL: Fix state tracking in situations with reused object handles

arm_disasm: ARMv6 media instructions

This menu is only for ROM and will not save symbols recently loaded.
When the menu is empty, the menu is disabled (greyed out)

SMLAD, SMUAD, SMLSD, SMUSD, SMLALD, SMLSLD,
SMMLA, SMMUL, SMMLS
USAD8, USADA8