Bug 445375 : Watchpoints cannot be disabled for targets that do not
support it

- add canPerformAction abstract method in base object action delegate
class
- add CToggleWatchpointActionDelegate that would also trigger
interactive triggering of watchpoints vs non-interactive.
- Check in each method & watchpoint delegates if
IToggleBreakpointsTarget does support the action
- Do not create duplicate watchpoints/breakpoints when toggling them
interactively

Change-Id: Idb1baaf171173b2d824a7cc50c8fe65e613f81aa
Signed-off-by: Teodor Madan <teodor.madan@freescale.com>
Reviewed-on: https://git.eclipse.org/r/34061
Tested-by: Hudson CI