filters: ResizeLinearLF: Rewrite.
filters: ResizeLinearLF: Rewrite.

Now faster, simpler and working for 16 bit Grayscale.

The code needs to be a cleaned a bit later though.

Signed-off-by: Cyril Hrubis <b1e90efd3b808b8e0bcf2a9a55fd8b9a779bfd81@ucw.cz>

gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim