New tall grass texture plus some minor touch-ups and fixes.

• Added textures for vertical dispensers and droppers.
• Fixed End stone not actually showing the custom texture; learned that texture names are case sensitive.
• Added pre-colored grass to sidegrass for unfancy people
• Tweaked the contrast of grass.
• Lightened outlines on diamond and emerald ore so they don’t look as pasted-on.
• Added shading to the spider web texture so it doesn’t just suck a whole bunch.
• Changed bedrock to a darker version of the normal stone texture, for now.