Fix the text scene node placing in viewports. The problem was, that the calculation took the absolute viewport dimension into account, while rendering into the viewport requires the screenwidth to be taken. Hence, the text was usually misplaced. The collision method can still be used for this mixed mode calculation (get screen coordinate during viewport rendering, use it for full screen rendering), but requires an additional parameter.
Software drivers don't support 2d rendering into viewports, so they still fail to properly position text (or other 2d things) into a viewport.

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Patch by Auria, which allows to render text in gui static text elements over the element clip area. This makes handling of changing text simpler. As default, this feature is turned off.

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Change addShadowVolumeSceneNode to replace the current shadow completely. This allows to change the shadow parameters, such that a call to addShadowVolumeSceneNode will always result in the correct shadow. Note that redundant calls to this method will be quite expensive now, so avoid them.

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Note: Currently we still will have the font-texture for CGUIFont's in the cache afterward.
But that needs a more general mechanims that allows cleaning up textures easier when the last one has been removed.


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- Fix problem that NULL device did steal focus away from other devices when created.


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Functions in IMeshCache expecting IAnimatedMesh* parameters removed as similar functions with IMesh* can be used since a while. Fixes also problems when IAnimatedMesh* got upcasted to IMesh*. (thx @ Greenya for reporting)


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Merged from 1.7 branch, revisions 3421-3447. Fix for Attributes, documentation fixes, disabled menu handling, treeview disabling.

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ITriangleSelector::getSceneNodeForTriangle, ISceneNodeAnimatorCollisionResponse::getCollisionNode, ISceneCollisionManager::getCollisionPoint and ISceneCollisionManager::getCollisionResultPosition.
As collision functions often are followed by changing node positions users where so far forced to using const_casts (found by Greenya).
(This will lead once more to many post about correct getCollisionResultPosition usage, but can't be helped - those consts were too restricitive, sorry)


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 - ParticleFadeOutAffector uses now throughout u32 for fadeOutTime (found by greenya)


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- Add missing setters/getters for particle emitters (seen by B@z)


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- Compile-defines can now be disabled from Makefiles/Projectfiles instead of having to change IrrCompileConfig.h each time (that's mostly to make it easier to use identical sources for client&server versions by simply using 2 different projectfiles)
- Disabled Xcursor support by default to avoid the additional link dependency on Xcursor lib (too many people got confused by that already).


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IGUITabControl::setActiveTab should only take IGUITab* and not IGUIElement* (thx to greenya for finding)


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- Add new skin-colors: EGDC_GRAY_WINDOW_SYMBOL, EGDC_EDITABLE, EGDC_GRAY_EDITABLE, EGDC_FOCUSED_EDITABLE
- Make sure disabled state is extended to sub-elements.
- Fix that icons in tabcontrol get also affected immediately by skin-changes
- Make disabled state for several elements more visible


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Merge from 1.7 branch, revisions 3389-3419. Only a valgrind warning in heapsort. Also skipped the date bump, which would cause too many conflicts. Will be changed later on manually.

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Bugfix: don't clear cursors in linux-device after the display has been closed already. Fixes crashes on application shutdown with more than one device.


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