pointer motion signal and default grab handler override

Giulio Camuffo giuliocamuffo at gmail.com
Thu Nov 14 14:42:49 PST 2013

this series implements two mechanisms to allow implementing things
like hot corners in a shell plugin.
It adds a signal to weston_pointer which gets firef when the pointer
moves and adds a way to override the default grab. The motion handler
is now in charge of calling weston_pointer_move() to actually move the
pointer, so pointer barriers can be implemented.

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