Auto-populating cheatsheets about dot_hammerspoon

[scottcs]

That's an interesting idea, and I'll have to think about it a bit. I wouldn't want to auto-populate cheatsheets that are more specific than at the app level (for instance, cheatsheets based on current open filetype in vim, or current tmux window, or current website in a browser (which is something I want to support eventually... in fact I should open an issue for that)). But for app-level cheatsheets, I like it as a starting point for new files.

I'm not very happy with the way the cheatsheet file names are currently being created, either. So this might work its way into a refactor of that code. Or possibly, a command could be added to the chooser to auto-generate an app-level cheatsheet.

Yeah, I'll have to think about this, but I like it.