Add breakpoint markers to list and list-instruction commands

[dylandreimerink]

Currently, the only way to know where breakpoints are placed is to look at breakpoint list and match the entries there to the code / instructions. It would be nice to have a breakpoint indicator like a red arrow or red arrow plus the breakpoint number besides/enfront of the code and instructions. That way it is obvious at which locations breakpoints are placed.

If a breakpoint is disabled we should color the arrow gray instead of red. If the breakpoint is conditional we should color it yellow or orange. For log breakpoints we should perhaps use a different symbol like a arrow like -> instead of a => arrow or =#.