v1.2.0

Version 1.2.0

- Changed Rooted to Skyrooted, fixing compatiblilty with Tinker's
Defense.
- Added Icestone, with 'Refrigeration' trait, like autosmelt but for the
freezer instead of furnace
- Added various fletching materials, namely Skyroot Leaf, Golden Oak
Leaf, Holiday Leaf, Crystal Leaf and Golden Feather
- Made some internal things more consistent
- Fixed names of fluids
- Added ability to disable melting of Gravitite Ore in the Smeltery, if
pack makers want to force use of the Enchanter
- Tweaked some colours