armemu: Join QADD16/QSUB16 and fix saturation clamping.

Join SMUAD, SMUSD, and SMLAD ops. Also fix them as well.

armemu: Backport some VFP fixes from 3dmoo.

Wrong values were being multiplied together.

The only difference between these ops is one adds and one subtracts. Everything is literally the same.

Comment out empty arrays causing compile errors in MSVC

armemu: Implement UXTAB16

Archive refactor

- Refactor FS::Archive internals to make Archive creation and lifetime
  management clearer.
- Remove the "Archive as a File" hack.
- Implement 64-bit Archive handles.

Fix spelling mistakes.

Added stubs for ldr:ro, cecd:u, nim:aoc, and am:app services

armemu: Fix UXTB16

Remove SyncRequest from K::Object and create a new K::Session type

I couldn't find any information about this service...

Apparently nothing at all is known about this service...

This is a first step at fixing the conceptual insanity that is our
handling of service and IPC calls. For now, interfaces still directly
derived from Session because we don't have the infrastructure to do it
properly. (That is, Processes and scheduling them.)

Rotation bits are 10 and 11, not 9 and 10.

Clean up armdefs.h a little.