feat: Added a new background (customized through the Options screen).

feat: Improved the Options screen a bit.
fix: Improved theming and layout (more modern).
fix: Removed the console size reset on open (don't remember why it was there in the first place?!).

Updated the release workflow to match the improvements of the nightly…

… one.

[Fix] Fixed (well... theoretically) the Release workflow (see CONTRIB…

…UTING.md for some info).

[Improvement] Updated CONTRIBUTING.md.

Updated for v2.0-beta3 release.

Removed old TFS information.

Quoted the path for the Task, so that install paths with spaces work …

…too.