Proofmode for Android 3.0.1 BETA 2

Full Changelog: 3.0.1-BETA-1...3.0.1-BETA-2

e6ecbc2 (HEAD -> main, tag: 3.0.1-BETA-2) update to 3.0.1-BETA-2
983c3b3 (dev/main) check strings for an invalid state response
1703f3a add built in viewer for C2PA manifest
6614aae encode the attestation certs in Base64
63f29b0 (tag: 3.0.1-BETA-1) update to 3.0.1-BETA-1
8fb9119 add initial proofsign client support (not yet implemented)
30120ea update c2pa init logic in ProofmodeApp
4ba1bff (origin/main) add more c2pa security patch level checks in the app
f4cecc0 add support for https://github.com/android/keyattestation to verify hardware certchain - get osPatchLevel from verified certificates
6675866 improve validation debug output
c6aca65 add settings file support with default trust anchors for validation
93cfe4e improve generation of settings json
d273ce6 switch stds.exif assertion into being created assertion
9941a76 updates for #126 for Build.VERSION.SECURITY_PATCH
9a86929 relates to #125 for C2PA Conformance - device must have recent security updates