C2PA Presence detection and validation

[g-maxime]

• Add an CLI option to reject modification of c2pa signed files (--reject-c2pa) + GUI setting
• Add an CLI option to verify c2pa signature validity (--c2pa-Verify) + GUI setting
• Add CLI options to export the c2pa's crjson (--out-c2pa[=] and --out-C2PA-json) + GUI menu entry
• Add CLI options to sign the wav file using user-provided certificates and manifest
• GUI dialog to display the crjson and validation result

[g-maxime]

Snappshots: cli, gui

• I have replaced Present/Absent in the technical CSV by Yes/No for coherency with the XML fields.
• In the GUI, C2PA validation and protection options are in the File management tab, I'll move that to the C2PA tab.
• Signature example using the CLI:
  ./bwfmetaedit --C2PA-Sign-Certificate=es256_certs.pem --C2PA-Sign-Key=es256_private.key --C2PA-Sign-Algorithm=es256 --C2PA-Sign-Manifest=manifest.json sample.wav