Debugger[CDB]: Refactor breakpoint handling.
Add a command to list breakpoints enabling id access. Implemented breakpoint handling similar to gdb using breakpoint ids (no longer delete and re-set all breakpoints on a change). Save the module that is reported back in the session so that it can be re-used for the next start. Keep a per-debugger-session cache of fileName->Module for adding breakpoints to accelerate setting breakpoints in the same file. Polish the breakpoint tooltip.