Adding Scheme to waterbear

TODO BEFORE MERGING:
- [ ] Code can be interpreted
- [ ] Output is shown in stage
- [ ] Complete set of Scheme blocks

Features that should be added:
- [ ] All lines that produce output are shown in the stage as opposed to the last
- [ ] A way to reset the users definition set so that the users can't delete a function and still successfully call it.

Should be other features and TODO's this is just what came to me off the top of my head