MCA File API

This release adds an API to read, edit and write MCA files.

Details:

• Read MCA files with MCAUtil.readMCAFile()
• Write MCA files with MCAUtil.writeMCAFile()
• Get chunks using MCAFile#getChunk()
• Get sections using Chunk#getSection()
• Retrieve block states with #getBlockStateAt() and set them with #setBlockStateAt() in either the MCAFile, Chunk or Section class
• Retrieve various other information like the biome, entities, structures, etc.
• Unit tests