Additional debugger features

[drhelius]

• [x] Improve debugger scroll
• [ ] RAM search
• [ ] Memory watch
• [ ] Memory find
• [x] Step Into / Out
• [x] Audio debugger
• [x] Logger (emu logs, state of CPU, current instruction)
• [ ] Break on cycles/instructions passed
• [ ] Run to address
• [x] Address bookmarks in debugger and memory editor
• [x] Simplify breakpoints (read, write, execute)
• [ ] In memory editor highlight changes for N frames
• [x] Copy paste from memory
• [x] Save disassembly to text file
• [ ] Add new debug symbols from debugger window
• [x] Breakpoints for VRAM, palette, registers