Amethyst 0.43.0 (alpha): Performance improvements

This build includes performance tweaks in every corner of the app. So, please pay attention to things that were working and are not anymore, and report back.

Happy Sunday!

Download:
- Play Edition with Translations: https://github.com/vitorpamplona/amethyst/releases/download/v0.43.0/amethyst-googleplay-universal-v0.43.0.apk
- F-Droid Edition without Translations: https://github.com/vitorpamplona/amethyst/releases/download/v0.43.0/amethyst-fdroid-universal-v0.43.0.apk