Stop tracking crap
Added ADD_SUB Module (Add only done)
Prototype 1 bit shifter for Joey just to avoid stalling MUL/DIV dev.

Disclaimer:
- Implemented as entity
Reason:
1) User-defined new operators are not allowed
2) Operator overloading possible, but implications on hardware are unknown (no time to test, whether it dupes hardware)
3) Implementing as function, implications on hardware are also unknown (no time to test)
4) Intends to implement final shifter using entity for familiar modularity testing

- Not final shifter implementation (input format will most likely change due to new design)

- Does not support arithmetic shifting