Rework Assets

[tobiasrohloff]

Okay, I really overdid it this time according to the changed files count. 🙈

Basically, this PR cleans-up and reworks all resources to minimize the required assets for new brands and to vectorize as much as possible.

Colors:

• The primary and secondary colors are set in the flavor config and their light and dark variants are calculated and generated automatically by build scripts.
• Rename some colors.

Graphics:

• Rework launcher icons. OpenWHO's adaptive icon is now vectorized as well.
• Rework login banners, they are vectorized.
• Rework splash screen banners. Unfortunately, vector graphics don't work nicely here. This is the only thing I'm not happy about since we have to keep them as density-dependent bitmaps and generate them for new brands. 🙁
• Rework profile screen. Remove the "stock photo" header image. Fix the error fallback image. Add button to edit profile in a web view.
• Rework all other in-app icons. They are all vectorized and unified. I also changed some navigation drawer and video player icons.

Themes:

• Migrate from Theme.AppCompat to Theme.MaterialComponents.
• General clean-up.
• Inherit dialog theme automatically.

[tobiasrohloff]

Thank you! :)

I'll check what causes the blurry rendering there.

[tobiasrohloff]

Everything seems good except for all flavors the login banner looks somewhat blurry.

That should be fixed.