Patch System, Small Features, Eject Sign, Fixes

We implemented a new patch system and added the first patcher for old
MinecartRevolution-Signs. Custom MinecartRevolution-plugins can also add
patchers without using Reflection etc. We also added a lot of small
features (there are too many for saying them here), e.g. new effects,
eject at coordinates etc. Moreover, we replaced the eject block with a
sign (for the coordinate feature) and fixed a lot of bugs (also in
QuarterBukkit, see this repository for more info).