Minecarts

+ Minecarts are destroyed instantly by creative mode
* Physics is much improved
+ Mostly implemented powered rails
* Players now search for an area around themselves to teleport to when
detaching from something
* Fixed curved rails being a little broken
+ Implemented detector rails
+ Implemented block collisions on rails
* Fixed snapping to rail
- Removed minecart physics conditions in Entity.cpp as minecarts use
their own simulator when on rails
* Fixed plugin values (re)generation
* Fixed a redstone issue affecting minecarts

Fixes #148 and #217; partially implemented #215.

I may "...[have a] history of doing things half-way through, then abandoning them..." (http://forum.mc-server.org/showthread.php?tid=1247&pid=10026#pid10026), but I always come back in the end :smiley:

This is Cave Johnson, and we're done here.