Add lc and bc aliases

This would help with the legibility of code, for projects that choose to use the `list-comp` and `binary-comp` aliases (instead of the `lc` and `bc` macros).

The Python Lisp (Hy) uses `list-comp` for the macro for Python list comprehensions, so this would also offer a sense of the familiar to anyone coming from Hy to LFE.