Refactored how TheTVDB api handles exceptions and how those are passed on and handled inside SR core

Fixed #484 - Mass Update Error caused by incorrectly handling show search formats as a checkbox value when it should be a integer

Fixed TypeError caused by failed searches not having show, season, and episode constants converted from string to int

Refactored mvgroup regex to enforce `series` needing to proceed after show name and before season number
Refactored mvgroup regex placement to affect scoring more accurately

Refactored transmission client web session handling
Refactored utorrent client web session handling

Refactored subtitle converter Subscene to work with new Subliminal 2.1.0

Refactored core web session exception handling
Feature added that allows searching episodes by collection format
Refactored name parser match scoring
Refactored name parser regex placement for mvgroup
Refactored show search types into SearchFormats class
Refactored main db to v12 and added in code to migrate old-style show search options to new-style show search formats
Refactored core API web session exception handling
Refactored providers by removing archetorrent and elitetorrent
Fixed season folder show option, needs to be invested as it controls flattening of folders show option
Refactored requirements.txt, updated misc packages