Many packet fixes, mostly 1.6.4 + support for 1.5.2

But still getting crashes on 1.6.4, investigating will take some time.
Also, there is lot of debug on legacy coders.
Fixed 1.6.4 & 1.5.2, add title 1.8 packet and other misc fixes
Non-Finished 1.8 map fix, javadocs cleanup
Begin on fall damage, more packet work, cleanup
Update readme and todo