This commit contains a few clean ups:
* In order to scale better for adding multiple commands,
the message formatting and setting switch logic was
extracted to its own function.
* The command lists were removed, as the frontend parses
the slash command from the compose box, and only sends
a single command to the backend for any given command
alias typed.
* The `switch_command` logic was removed because, given
the aforementioned fact, the index of the command will
always be the same. Thus the switch command will always
be the same.
* Switched to using early returns as opposed to nested
conditionals. Along with removing single use variable
declarations.
The slash in command is stripped in the backend,
rather than in the client to make the client code
cleaner.
This would make client code cleaner in the slash
commands which include parameters.
Move the zcommands from '/views/messages.py' to
'/lib/zcommand'.
Also, move the zcommand tests from '/tests/test_messages.py'
to '/tests/test_zcommand'.
Wyatt Hoodes
Cynthia Lin
Rhea Parekh