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
The second arg isn't used but I'm only comfortable removing those 2-arg usages with feedback from @ibdknox on why they are that way i.e. are there any hidden bugs caused by this behavior. Rather than block on @ibdknox for this PR, I'd vote to add the 2-arity and we can revisit it later.