[Gtkradiant] reflexions about the new camera code

[Timothee Besset]

Gef and I were discussing the new camera functionality in GtkRadiant. It 
seems that some of the reports we may be getting about keyboard issues are 
actually because the arrow keys are now interpreted for a smooth movement. 
Which Gef and I don't think is a good thing.

Having a smooth movement (key down / move - key up / stop moving) makes 
sense in freelook mode, but otherwise it's much faster to manipulate the 
editor and run around objects with step increments.

We might need to leave that as a pref setting too, but I think it's 
something that has to be settled before RC.

TTimo