XBMC-PVR: Add "Find similar programs" to Timers context menu

By adding the "Find similar programs" option, users are able to search
for upcoming showings of the same title.  This is particularly useful
for timers that are in "Conflict Error" with one another.  This provides
a quick method to re-shedule a conflicting timer.  The order of options
in the context menu has been re-ordered to reflect the most common actions
to resolve timer conflicts.
Merge pull request #3494 from guyrichie/timer_context_m

XBMC-PVR: Add "Find similar programs" to Timers context menu