macOS App Icon fix

[DigiH]

• Apple UI guidelines adherent Finder icon and Dock icon • Delete now unnecessary Image.xcassets directory and its content • Required changes in Theengs.pro and main.cpp

Bulding fine with desired icon results

https://github.com/theengs/app/actions/runs/2524476503

[emericg]

I guess we can merge that? Not sure who has authority now though ^^

[DigiH]

I suppose you with doing the reviews should be fine, what does @1technophile say?

[emericg]

Ultimately it's a look and feel issue, he should have the last say in what the icon looks like.

[DigiH]

Didn't really show the new icon with the wider margins, and not sure if @1technophile can view the .icns file, so here are a few different size screenshots

[1technophile]

looks great! @DigiH