Phong Bumpmap updated

Features of this commit:
1.- no longer renders in little tiles of 100x100 (instead it uses the default set by DmitryK for all filters of 500x500 at a time)
2.- prepares a bumpmap in RGBA 16 bits instead of 8 bits.
3.- no longer crashes or renders garbage when rendering to a colorspace of more than 8 bits. (But the faulty GUI will cause crashes on anything other than RGB for now).

Improvements left to complete:
1.- fix the GUI so it doesn't cause absurd crashes.
2.- clean the code to hide the smell.
3.- impress people.