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
So `on-yes` isn't referred to anymore elsewhere in the codebase? Doesn't seem like it would be, but just making sure.