Reforestation

v1.5.0
Actually fixed a thread bug.
v1.4.2
Fixed a thread bug.
v1.4.1
Updated to 1.4.6.
v1.4.0
Updated to 1.4.5.
You can now disabled planting in certain worlds.
v1.3.0
Placing requirements now come from each block's class instead of being the same as a sapling's.
The thread delay value now works when you change it in the config.
Uses an array for saplings types instead of a list for faster access.
v1.2.3
Actually fixed a major replanting issue.
v1.2.2
Fixed a major replanting issue.
v1.2.1
Added a configurable thread delay.
Fixed a few memory leaks.
v1.1.0
Added Plugin Metrics support.
v1.0.1
Fixed a stacking bug.