Corrected behaviour of viewer snapshot function. It is now possible to specify snapshot sizes up to 8192x8192 independently from the glwidget. Additionally a "keep aspect ratio" check box has been added.

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Removed light handling from BaseViewer
Added singals to MouseInterface to handle light events

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Previously the standard enter and leave functions had been active for picking too,
resulting in picking failiures when e.g. Blending was active.

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Activated multipass rendering: The traverse function executing the draw action of the scene graph will now be called multiple times in order to render in multiple passes. The number of rendering passes will be determined by a mutlipass information action that is called before the drawing action.

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Enabled multipass

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Added a new signal to base viewer which is only emitted if the view has changed and not every time when the scene is redrawn

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- Changed "Ego-Shooter" into "First-Person"
- Defined moveForward, moveBack, etc. in QtBaseViewer
- Updated first person mode such that it takes a mouse click to navigate around

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Set always a perspective projection matrix Stereo mode.
Setting a orthogonal matrix in the state and rendering with the perspective stereo matrix breaks the project/unprojoce calls.



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Added gl based cursor painting.



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