ZLTweaks

Added optifine support.

• Overrode optifine's default glass with a mostly clear variant.
• Overrode optifine's sandstone side.  They include a separate texture to change the sides, but there's really no need to since Vanilla already provides that texture.  Pointed properties file to that instead.
• Grass now no longer cuts off suddenly for several blocks, and instead overgrows slightly over to make things feel more natural.  Grass will grow over the following blocks: [dirt, coarse dirt, farmland, stone, smooth stone, stone bricks, cracked stone bricks, chiseled stone bricks, the various ores, sandstone top, red sandstone top, as well as top/double slabs of supported blocks, and the top of stairs when placed upside down]
• They make excellent paths.