the text implementation to provide better speed, especially by using the
alignement to screen option.
Deprecated the Text::setFontSize(,) method, which is now being replaced
by setFontResolution(,)
Fixed typos in Texture*.cpp.
Removed old deprecated methods from osg headers.
Removed the rescalling of images in osg::Image during texture apply, moving
the rescale so it is locally calculated. This solves an outstanding threading
problem which occured by multiple draw threads all tried to rescale the same
image at one time.
Made osg::Image ptr in osg::Texture2D non mutable as it is no longer modified
during apply.
