unpack_texureBlendFunc => unpack_textureBlendFunc in D3D8 (was renamed recently). Thanks at greenya for noticing!

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Merged revisions 4001-4056 from 1.7 branch. Keycode updates, fix compilation errors, vector normalize error case fixed, joystick safety fixes, editbox updates, meshviewer modal window fix, isPointInsideFast changes.

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Fix billboard error which used the wrong width for top and bottom width of trapezoid billboards. The reason is the use of cross-product, which flips the vertical axis used in calculations. Properly documented in the code now, API now works as expected. Bug and fix provided by pc0de.

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Oops, misread the switch. Alpha representation always requires 32bit, so reverted to original code with just another empty default statement.

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Add some convenience wrappers for simplified shader generation in the default cases. Suggested and implemented by curaga.

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Add new normal render method to all places where this is already supported. Thereby replacing some of the old and time consuming normal renders, as pointed out by pc0de

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Fix warning about conversion. We might have to do it vice versa, though, comparing the float values and passing a converted number down to getMesh.

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Add a FPS setting for animated meshes. This allows to store an overall animation speed for a mesh, which enables reading this information from the formats that support it and set the animation speed in scene nodes accordingly.

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Change interpolation mesh to pointer usage and dynamic memory allocation. Necessary due to reference counting.

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