[WIP] Continuation of redstone support

This will be a continuation of iamgreaser's redstone framework pull request (https://github.com/GlowstoneMC/Glowstone/pull/215), which was closed by him. I think its a very good start for redstone support in Glowstone, so i wanted to continue it.
This is my first pull request, so please say if i did something wrong. (I know i have to merge the branches, but i'll leave that for later)
I will write a todo list later.
Currently I added the redstone block and the lever.

I think it is ok to use his commits, since he said it to someone else, that it would be okay.
If not @iamgreaser, please just say it.