* Rewrote event handling: instead of writing every single device message to
the event port, they are just queued in a list, and the event loop is only
notified if necessary (ie. if a notification has been sent already, new
events are just queued up until the input_server found the time to process
them).
* This also fixed a big memory leak: every message processed by EnqueueDeviceMessage()
(IOW every key or mouse event) was leaked!
* no longer abuses gInputMethodListLocker to lock the method event queue
(it now uses the standard event queue lock).
* removed the completely superfluous, weird and decelerating event caching mechanism
* tried to find a better distribution of work between _SanitizeEvents(),
_MethodizeEvents(), and _DispatchEvents().
* HandleSetMousePosition() now only does what it's supposed to do (this currently
causes the mouse to jump at the start, though).
* now uses the "Message4" for message sending if available.
* fixed "kb_mouse_settings.h" to include all headers it needs.
* some more cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14966 a95241bf-73f2-0310-859d-f6bbb57e9c96
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