Hotkey functionality

As requested here #31 I added a new settings option for enabling / disabling hotkey functionality for the program.
Currently the hotkey is a static one, meaning can't be changed by the user. In the future I'd like to change this. However, I felt like it had taken way too long already, so I quickly wanted to add this feature.

Unfortunately, for this release it won't just be a singular .exe file. It'll be a folder containing the .exe and two libraries. The .exe file needs to be located within the same folder as the two other files, as they are dependencies. This is most likely something that will be changed in the future.

The program was created using .NET Framework. Which is, relatively old. I'd like to - at some point in the future - to recreate the program in .NET Core, which has some never features and whatnot. When that happens, the release will be back to being a singular .exe file. Though I don't know how long it'll take. Reason being is education. I completed one exam yesterday, and the next ~2 months will be spend focused on my final exam.

Anyhow, that should be a long enough status update. If there are any more features you'd like to see in the program, feel free to create an issue and suggest it.