Adds menu install version checking functionality and fixes a lua error when with creating a preset with an empty addonpresets.txt file.

If you have manually installed the new Workshop Collector menu, you will need to update lua\menu\workshop_collector_menu.lua again from github at https://github.com/Lemon-B-Citrom/gm-workshop-collector/releases/tag/version-2.2

Adds the ability to update presets without copying and pasting files! See the new guide linked in the workshop description.

Fix a bug where the preset key differs from the preset name, causing angular.js to throw a hissy fit somewhere in the gmod backend