[Feature Request] Ability to manually add usage

[RussPitcher]

It would be useful to be able to manually 'use' filament by entering # mm/metres used for situations where you might clip off a length from a spool or such like. I know I can manually edit the weight/length used fields but it would be simpler to be able to enter a length into a box and have the plugin calculate the changes.

[OllisGit]

Closed: Duplicated issue, see #79, #64
PS. Sorry, for being late to the party, but I made a "Octoprint sabatical" (no coding, no printing) the last months.