Delete old version of mod when updating

[GeckoEidechse]

Related #401

Example https://northstar.thunderstore.io/package/DINOTICK/SpinnyAlternator/

Downloading 1.0.0 and then updating to 2.0.0 doesn't remove 1.0.0 causing a double install and a FlightCore that claims mod can be updated.

The solution is to nuke 1.0.0 when 2.0.0 installs succesfully.

[GeckoEidechse]

Solved with #429

[GeckoEidechse]

Closed by

• feat: Support reading mods from Northstar packages directory #417
• feat: Add ability to delete package #425
• feat: Support installing Thunderstore packages #426