Added support for partial chunk/region load

[prydin]

Implemented partial load of chunks and regions as described in #48.

[coveralls]

Coverage increased (+0.6%) to 89.906% when pulling 49e613b on prydin:prydin-partial-load into 0755fe5 on Querz:master.

[Querz]

LIQUID_TILE_TICKS should not be the same as TILE_TICKS

[Querz]

LIQUIDS_TO_BE_TICKED should not be the same as LIGHTS

[Querz]

Right now when trying to save a chunk that only has been partially loaded it will throw an NPE (see Chunk.java#L600 which is called in Chunk.java#L133). I think it would be better to throw an UnsupportedOperationException with an appropriate message when trying to save a chunk with only partially loaded data.

[prydin]

Thanks! I also realized that I have a lot of OR when it should be AND. I have NO idea what I was thinking. :)

[prydin]

Made a lot of changes:

Fixed all my bugs described above.
Added test cases.
Fixed typo on Heightmaps in serialization code.
Upgraded to gradle 6.5. The older version didn't support modern JDKs.
Added check for partial chunk on serialization.

[Querz]

• removed Intellij module file
• added .iml files to .gitignore
• gradle-wrapper.jar had the checksum of gradle 6.0/6.0.1 (see https://gradle.org/release-checksums/), upgraded everything to actual gradle 6.5

[Querz]

• adjusted formatting to match the rest of the code
• removed deletion of tmp file from unit test because NBTTestCase#tearDown() takes care of that
• removed code duplication in MCAUtil
• removed unused import
• renamed CARVINGMASKS to CARVING_MASKS for consistency

[prydin]

Thanks! Is this ready to be merged now, or are there more changes you'd like?

[Querz]

lgtm