Add move (note mv) command

[Escyll]

Resolves #79

Checklist

• [*] I have made a change to this repository, be it functionality, testing, documentation, spelling, or grammar.
• [*] I updated my branch with the master branch.
• [*] I have added the necessary testing to prove my fix is effective/my feature works (or I did not modify functionality).
• [*] I have added necessary documentation about the functionality in an appropriate .md file.
• [*] I have appropriately commented any code I have modified. I followed the existing style

Short description of what this PR does:

• Adds notes mv <name> <destination>|<directory> functionality

[Escyll]

Note that name may be an absolute path. For destination and directory I chose for relative paths only, since I think it would be weird to move a note out of your notes directory.

[pimterry]

Perfect, thanks! :+1: