[root] FlashFire

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Release notes: https://plus.google.com/+Chainfire/posts/C7H97RLfcRu

- A/B OTA: Support for more variants
- Magisk support: Improved OTA flashing compatibility
- SuperSU: Updated to v2.82-SR4
- Backup: Exclude paths from backup
- Restore: FBE issue fixed
- Wipe: Add option to not wipe files from internal storage that aren't backed up
- ZIP: Open ZIPs from file managers and (Chrome) downloads directly, or share to FlashFire (file must resolvable to reside on /data)