Add support for application blacklist

[Dainius14]

You're not allowing to create issues as feature requests, so I'm creating a PR for a feature I need myself.

This feature adds a new "blacklist" alongside whitelist. Blacklist would force LightBulb to run even when "Pause in fullscreen" is enabled. Reason for such a feature: I have pause in fullscreen enabled, so I can watch YT or game without orange tint. But I also work via RDP, so from the perspective of LightBulb I'm fullscreen and orange tint is not enabled because of the first setting.

Updated UI:

Points for discussion:

1. Whitelist and blacklist names should be switched. Currently adding an app to whitelist will disable LightBulb for that app, but that seems like definition of "blacklist" - to exclude something. Right now it feels strange to blacklist an app for it to always be tinted.
2. No unit tests? Should I introduce some? Feels weird without them. Would need some minor refactoring though, could introduce that in a separate PR