0.9.0-mc1.12

Notes:

Performance improvements, stability and fixed some bugs.

Changelog:

• Fixed render and debug command initializing on the server-thread causing a huge lag-spike when issuing /bluemap render on larger worlds
• /bluemap debug is now /bluemap debug block
• Added /bluemap debug cache command that clears internal caches
• Render threads are more stable now and should be able to deal with unexpected exceptions and invalid chunks
• Fixed non existent region files throwing a FileNotFoundException
• Updated a apache.commons library version for a bugfix