switch to using a database for clipboard history

[unsecretised]

Fixes #280
partially ixes #233

How this works:

• when someone copys something it checks if its exists (if it does, it reorders it inside the UI
• it stores the item in the db
• when rustcast starts, it loads up the data (limited to last 300 items) from the db

pending:

• allow the UI to retrieve and view more history (more than the 300 thats there right now, but I think that can be added later)

[unsecretised]

Most of the change was in the Cargo.lock because of rust version update