[haiku-appserver] GetMouse()

Hi there,

I've worked a bit on GetMouse(), and I think it's now more or less 
correct.
It still doesn't work correctly, but this time it's probably the 
app_server's fault, as we only rarely get _UPDATE_ messages. The only 
notably difference to the previous version (when used with the 
playground test app) is that the BButton is redrawn once during a 
click, unfortunately, still in unpressed state.

As I don't know a whole lot about the drawing stuff, I have no idea how 
to get the app_server to send _UPDATE_ more often. If I change 
BControl::SetValue() to use Draw() instead of Invalidate() (which is 
not really okay but works) I at least see a flash of an inverted 
BButton, but it doesn't last for long.
The messages that GetMouse() gets are correct, so the app_server seems 
to be the culprit.

BTW in case of B_ASYNCHRONOUS_CONTROLS, there is probably no need to 
call Invalidate() in BControl::SetValue().

Bye,
   Axel.

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