Choco: Add short aliases for common choco commands

[ExE-Boss]

I believe that the following commands should have the following short aliases:

| command | aliases
| ---------- | ---
| install | i
| list | ls

This way, it’s possible to use the short variants, which are faster and easier to type, especially when compared to clist and cinst, which are different programs in the mind of anyone who deals with UNIX‑like environments, where it’s a practically non‑existent practice to create alias executables, which is why I instinctively write choco by muscle memory, and by that point, switching to clist or cinst is too late.

[ferventcoder]

cinst and clist are deprecated - we have no idea when we'll remove them, but cpack conflicts with other tools, so it's best to stick with choco command. As far as short aliases, that remains to be seen.

We already have plans for choco ls that might be slightly different than list IIRC.

[Croydon]

That choco's cpack shadows CMake cpack is a problem for me. Now I need to worry about the PATH order on my Windows installations

https://cmake.org/cmake/help/v3.10/module/CPack.html

[FranklinYu]

@Croydon Please follow #89 instead.