Handle deep-nested indexed structured XMP properties

Add support for a deeper indexed->structured->nested->leaf XMP property shape. Implemented parse_indexed_nested_structured_deep_xmp_property_name, a PortableIndexedStructuredDeepNestedProperty struct, comparison/hash/eq types and a claim-owner map, plus sorting and emit logic to integrate deep-nested items into the portable XMP dump flow. Updated existing resolution/claim checks and extended dump_xmp_portable to collect and emit these properties. Also added a small header comment for Tracks markers cuePointParams/key. Tests were extended to cover new managed/reference/event fields (manageTo, manageUI, softwareAgent, parameters, and cuePointParams) and adjusted ordering to validate the new behavior.

Author: ssh4net

src/include/openmeta/xmp_dump.h

@@ -104,6 +104,7 @@ struct XmpPortableOptions final {
     /// `contributedMedia[1]/duration/scale`,
     /// `Tracks[1]/trackName`,
     /// `Tracks[1]/markers/name`,
+    /// `Tracks[1]/markers/cuePointParams/key`,
     /// `resampleParams/quality`,
     /// `startTimecode/timeValue`,
     /// `timeScaleParams/quality`,