Update oil to use 1.5 texturing

Updated BlockOilFlowing to include methods to use 1.5 texturing for liquids. 

Added in a copy of the water texture/animation files named right to use as the oil texture/animation files.

Only thing needed is for someone with texture skills to reskin the texture files to what the oit is meant to look like.

Hopefully it all works. If oil has already been updated for 1.5 textures do not merge this.