Update fallback clientside-modslist automatically

Instead of having a user to manually click a menu entry in order to update the fallback list of clientside-only mods, have SPC acquire the list from the repository at startup.

Any new entries should get added to the list present at the users config. TreeSet<> rulz!

changed milestone to %Version 5 - Peauty!!11!

added Enhancement label

assigned to @Griefed

added Refactor label

mentioned in issue #217 (closed)

marked this issue as related to #217 (closed)

marked this issue as related to #162 (closed)

marked this issue as related to #215 (closed)

closed