Added a configure option called --enable-standalone-xpbproxy which is useful for deveoping xpbproxy.
The 'active' switch in preferences just disables the in-server xpbproxy (not this standalone).
instead of calling CFRunLoopRun() directly. The leak wasn't reproducible on
this machine, but someone was able to produce a leak trace with Instruments
that indicates it was leaking in the CFRunLoopRun() path.
x-input.m: dequeue and ignore events when pbproxy_active is false.
x-selection.h: add an is_active method that is used by x-input.m to ignore
events.
x-selection.m: Handle nearly every preference, except for primary_on_grab,
which I don't really understand yet.
Remove some unnecesssary headers.
Remove some dead code that was never called or used in pbproxy.
Make use of an NSAutoreleasePool in x_init. It could potentially cause a leak
on a startup without this.
Start adding reload_preferences to the x_selection class, as well as event
handling for that.
