ramdisks+zipfiles: Unified v2 f2fs/ext4 support
Unified:
- support any possible configuration of partition formats, by detecting the fstype and swapping in the appropriate entry
- Add working static+stripped busybox 1.22.1 for f2fs blkid support (thanks @jimsth!)
- Add workaround for f2fs encryption to function with Unified ramdisk: Non-encrypted can still use any combination of ext4 and f2fs partitions; Encrypted must now also format cache to the same filesystem as data so that the correct entry can be used for the fallback decryption

fkbootscript:
- move fstab userdata options workarounds to bootscript, using Unified system props
- clean up and update bootscript tweaks, including f2fs RAM threshold adjustments (Thanks @boype!)