Working to make Shell work.

- Added global for ESC.
- Reenabled Terminal interupt
- Added ANSI control code to move down line
  - Needs to be implemented
Merge branch 'dev' into new_shell
Made commands work again.
Merge branch 'dev' into new_shell
Fixed prompt so it displays on correct line.
Merge pull request #33 from JacobLeach/new_shell

New shell