F-Droid Support!

- Removed Google MLKit, gzips, shared libraries

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Features
- Quick send and quick receive flows
- Send files or clipboard text
- QR code generation for fast pairing
- QR scanning for receive
- Saved send and receive codes
- Transfer history and favorites
- Android share-sheet support
- Received files published to Downloads/croc-received
- Material 3 UI designed specifically for Android
