Glowroot Caves

**Changelog 1.0.8.7:**

- One year and 1/2 anniversary of Glowroot!
- Finally retextured Glowrooted Stone's top and side textures to look good.
- Changed the ambient biome music to be MUCH QUIETER and also slowed down.
- Any variant of glowroot flora (flowers/grass/plants/and even combined blocks,) that are broken inside of a glowroot cave and planted on a variant of glowroot stone, can eventually re-grow in the same place.  There is a new gamerule, Regrowthchance, that determines the actual percent chance of the flora actually being replaced. It is naturally set to 100. Lower values = smaller chances of regrowing.
- Edited the quadcopter's ai to re-target enemies quicker and also have a "warning signal" before attacking. 
- Increased quadcopter and glowroot golem spawning.
- Changed tons of mining strengths of blocks (Chrysoprase crystal blocks are now slightly faster to mine, and Glowroot Stone blocks/some ores now only need a stone pickaxe to break, rather than iron for all.)
- Fixed the glowroot golem's drill texture variant to match the new updated textures, along with the glowroot zombie.
- Removed Melted Chrysoprase Buckets from the creative menu, as they are still WIP
- Retextured a few left-over block/item textures.
- Fixed particles when mining certain custom-model blocks.
- Changed the advancement screen background
- Changed a few recipes to be easier for progress.
- Fixed a few issues/minor bugs