Added three frequency levels for resource watching

 It's now possible to register watchers along with a specified check frequency. There are three frequencies: low, medium, high. Each one is associated with a check interval that determines how frequent the watchers will check for changes and notify listeners if needed. By default, the intervals are 5s, 30s and 60s respectively, but they can also be customized in the settings. also:

  - Added the WatcherHandle construct by which one can stop it (remove it) and resume it (re add it). Also provides access to the watcher itself and the frequency by which it's checked
  - Changed the default frequency to 30 seconds interval (used to be 60 seconds). The only watcher that is currently effected by this is the script watcher (now auto-loading scripts will auto-load every 30 seconds if changed)
I think 3 levels should give enough flexibility (not sure about 2 levels though). We could lower MEDIUM a bit... maybe to 25 or 20?