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Fix fxaa with float FBO

Michael Migliore requested to merge michael.migliore/vtk:fix-tone-mapping-fxaa into master

FXAA filter creates a GL_RGB8 texture resulting in a clamping of values in the current fbo if it is in a floating point format.
This MR fixes this issue by creating a texture with the same format as the current color attachment.
This MR also fix CopyFromFrameBuffer method that was incorrectly using Format instead of InternalFormat.

Edited by Michael Migliore

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