Fix for when clipboard is empty.
Merge pull request #211 from tyteen4a03/master

Code cleanup, moved Vec3D and Vertex to utils, renamed IOUtil to StreamingUtil
Merge pull request #214 from UnknownShadow200/PasteFix

Fix for when clipboard is empty.
Fixed chunks with no blocks in render pass 1 not being drawn.
General cleanup of LevelRenderer, also works now with worlds with axes that are not multiples of 16.
Fixed progress bar being completely white.
Fixed screenshots being stuffed up.
Corrected indention.
Merge pull request #216 from UnknownShadow200/BugFixes

Some bug fixes and cleanup.
Fixed some buttons being disabled

Crude fix for now, will need to be fixed again later if more things are
added. We will need to find a better way to get about this.
Replaced all .0F instances with F (saves bytes!)