ARM: Fixed several dyncom bugs.

- Fixed NZCVT flags to properly save state when function returns.
- Fixed counter to keep track of the actual number of instructions executed.
- Fixed single-step mode to only execute one instruction at a time.
- DefaultIni: Removed comment that no longer applied to dyncom.
ARM: Removed unnecessary goto with each instruction.
Citra-Qt: Use Core::RunLoop when not single stepping.
Core: Changed RunLoop iterations to 1000 (slightly better performance).
ARM: Fixed dyncom to use reg15 for PC (this core doesn't use pc variable).

- Fixes single stepping in debugger.
Merge pull request #186 from bunnei/fix-dyncom-bugs

Fix dyncom bugs