Added commands to clipctl to check the status, toggle, get version and directory

[AckslD]

This adds four new commands to clipctl, solving #151:

• status: returns "enabled" or "disabled"
• toggle: toggles clip collection
• version: returns major version
• cm-dir: returns the directory used for caching

I also changed other files to get the cache directory from clipctl cm-dir. I found this nicer to have it in one place, rather than having to have the correct folder set in each file. However, this is not required and I can revert that if you don't like it.

[cdown]

Looks great, thank you!

[AckslD]

My pleasure :)