RPEngine

* :star: **Added the dashboard** - a more user-friendly way to start the addon's setup. It will always show when you first log in.
* Removed the 5e and Warcraft default datasets. Only default classic (5e-based) will be available.
* Fixed a massive lag spike when interacting with class spell trainers (it wasn't filtering spells by class tag).
* The DefaultClassic ruleset and dataset are automatically enabled when you log in for the first time.
* Fixed a problem where spells were always hitting even if they said they missed.
* Fixed a problem which was causing the event leader to see the remains of unit portraits in the event widget when advancing the tick.