Bring UI for icon/flyout enhancements done in EarTrumpet

[petrroll]

Since most of the UI is based on EarTrumpet we should backport all of their updates to UI since September 2017.

Might help with:

• animation fluidity
• light/dark theme support
• better DPI support
• tutorial window

[petrroll]

Unfortunately I've stopped development of this app so I (most probably) won't be looking at sorting this personally. Anyone, feel free to contribute a PR/create a fork.

More info in #23

[Gaalidas]

On a whim I decided to download the EarTrumpet source and see if I could figure out what is going on. Let me be frank here... It's a complete and utter mess. Something in the project files is stopping the IDE from even analyzing the code properly. It's not recognizing missing reference information (and it's got every reference including system ones flagged as not loaded properly, despite deleting and re-adding them) and it won't provide any IDE assistance in code fixing or refactoring. I don't know what sort of enhancements that program has received lately, but it's near impossible to make any sense of. Back-porting anything from that project is, in my opinion, a really bad idea.