Common library changes

Removed extra .editorconfig file as well as leftover Ini importing code and duplicate UPS code, relocated prefs-related classes into their own folder & namespace, and moved the SerializedProtectedString file back into the main library/namespace.
- SerializedProtectedString: Standardized naming conventions w.r.t protection/encryption. Made two properties to help control serialization (fixes unprotected strings being written to the settings file), added cast operators, and a new constructor to also assist with serialization.
- WinNUT_Params: Cleaned up class structure, simplified params loading method, removed param saving method, created param export and deletion methods
- UpgradableParams: Corrected reference to Password property, removed public property for the old params, updated how old params are counted, created an upgrade worker arguments subclass.

Author: gbakeman