Debug UI - minor issues

[42Bastian]

• disable besides delete breakpoints/watchpoints
• code exe breakpoints are sometimes "missed". For example setting one at $200, F3, F5 => does not halt
• Modifying "S": Only the low byte should be writable.

[42Bastian]

• scrolling in the disassembly window with the slider is toooo quick. Adding also cursor keys for scrolling would help like in the memory window
• multiple disassmbly and memory windows.
• Nice to have: Inline assembler ;-)

[42Bastian]

• breakpoints are not re-applied automatically after reset/reload

[42Bastian]

• brk on Lynx is brk #n, thus a 2 byte instruction

[42Bastian]

• Watch breakpoint: Choose whether CPU or SUZY writes to RAM: Detect sprite issues.
• Memory dump: Dump for Suzy and Mikey memory independent of RAM.