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.
in stopped state. Add helper for executing calls
to ExtensionContext including recording of output in
OutputCallback. Extend symbol resolution to return addresses
as well since QApplication::widgetAt() is ambiguous and needs
to be called by address. Add 'widgetat' extension command
to return the widget.
