Use QScopedPointer for private class
Support several new opcodes and better message for unhandled opcodes
Changes to Memory and Keyboard

Support more keys
Replace QMap with simple array
Improved keyboard

Handle F0 key and better handle keys with AltGr modifier
First version of PSG AY-3-8912

First version of PSG AY-3-8912 emulation for audio output.
Merge branch 'develop'