Added backdrop for history view
Added opacity style to views with backdrops

Cut main show view load time down by 6s

Fixed sorting for all tables
Fixed filtering for all tables

Case-insensitive sorting fixed for shows view

Removed table footer from history view

Fixed small poster sizing for shows view

Migrated misc css classes to bootstrap 4

Fixed confirmation dialog boxes for history and mass update views
Changed text color from white to dark for episode statuses view
Added css for jquery confirm package