v2.3

I've been working on refactoring the code for a while for the possibility of adding this to the Windows Store. I've made the code layout much more intuitive so that others can more easily contribute in the future. Please create any issues if you notice something not working as it should after the refactor.

Backend

• Refactored code to make mainform.cs no longer a superclass.
• Group tab loads faster.
• Only one instance of Minimal Firewall can run at a time now (as long as it's not pre-v2.3).
• Significant memory updates, including better garbage collecting and faster startups, loading the other tabs only on demand.

UI

• Updated buttons.
• Determinate progress bar.
• When popup notifications are turned on, it will also appear in the dashboard.

Bugs

• Fixed groups freezing
• Should now start with Windows correctly.
• Fixed dark theme flash when first starting program.