Little Changes

I added more texture modifies:
- Netherrack block and quartz ore block got a bit different color again,
- Netherbrick block got lighter, a very bit more reddish color, the Netherbrick item too
and the red Netherbrick block got a bit more reddish color,
- zombie pigmen got almost full green color, except their bone parts,
- shears got light gray color, like the iron, so it's look like it's crafted fully from iron,
because as we know, the shears can be crafted from 2 iron ingots,
- horse armors got more similar color like the iron, gold and diamond.