Reduce number of compile-time warnings

Hi,

I decided to try to fix issue #1658 . Here's my first attempt. 

- fixed most of the `Wrong number of args` warnings
- fixed couple of `Use of undeclared Var` in object.cljs, app.cljs and command.cljs
I'm not a big fan of these aliases in general, and the command aliases in the sidebar specifically have been a lot of hassle with the layout redesign and renaming. It's outside of the scope of this issue, but I'm making a note that we need to deprecate these methods here if you folks are okay with it. @cldwalker @one-more-minute