Fix Load->All, Load->None, and Load->Bethesda ESMs:

Load->All was activating plugins, but the UI wasn't updating
Load->None was attempting to deactivate plugins not allowed by libloadorder
Load->Bethesda ESMs:
* Was only including the main ESMs, not DLC
* bethDataFiles did not have Dragonborn.esm in the list
* Had issues (case sensitivity?) activating plugins

Closes #91