[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)
TODO:
- [ ] Make torches 2-tick not 1-tick
- [ ] Get torches to burn out when flickering
- [x] Redstone placement on slabs
- [ ] Redstone support on slabs
- [x] Redstone block - DONE
- [x] Lever - DONE
- [ ] Pressure plates
- [ ] Buttons
- [ ] Redstone lamp
- [ ] Repeater
- [ ] Daylight sensor
- [ ] Redstone comparator (comparing & subtracting; block state measuring maybe part of another PR)

I think redstone devices like dropper, dispenser and so on should be part of another PR.

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.
You'd better use a boolean for on/off instead of every material.