Chunk rendering #4

Abandoned arraylists for treemaps :)
Chunk rendering #4.1

Forgot to remove deprecated stuff
Minor Cleanup
Minor Cleanup
Minor Cleanup + Restructure
Multithread preparations
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Multithreading

This was one of the far most challenging updates in JBlox. Running two
threads, side by side, sharing information and working together without
interrupting or loosing any rendering performance led to many tests and
tries. Finally done with the first commitment!
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Update README.md
Textures

Not only grass :)
Texture improvements + Bug fixes

Improved texture selection, added height determination. Fixed light bug
and double grass issues.
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Visual Update

Removed lines between blocks + minor improvements
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Improved rendering and clipping
Slight performance tweak + Texture update

Bottom and top layers will not be rendered if there is solid blocks
around the active block.
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Update README.md