RomaFeaturesMatcher: support multiple features folders

[Copilot]

RomaFeaturesMatcher previously accepted a single features folder, preventing use with features spread across multiple sources.

Node descriptor (RomaFeaturesMatcher.py)

• Replaced desc.File(name="featuresFolder") with desc.ListAttribute(elementDesc=desc.File(...), name="featuresFolders") — the node now accepts one or more folder connections.

Python implementation (featuresMatcher.py)

• compute_featuresMatcher: featuresFolder: str → featuresFolders: list
• Feature loading now searches each folder in order, stopping at the first hit per image. Reference and "other" images are resolved independently, so features for different views can live in different folders.
• Argparse: --featuresFolder (single str) → --featuresFolders (nargs='+')

# Per-image independent folder search with early stopping
for folder in featuresFolders:
    ref_feat = f"{folder}/{referenceId}.dspsift.feat"
    ref_desc = f"{folder}/{referenceId}.dspsift.desc"
    if os.path.exists(ref_feat) and os.path.exists(ref_desc):
        regionsRef.Load(ref_feat, ref_desc)
        break
for folder in featuresFolders:
    other_feat = f"{folder}/{otherId}.dspsift.feat"
    other_desc = f"{folder}/{otherId}.dspsift.desc"
    if os.path.exists(other_feat) and os.path.exists(other_desc):
        regionsOther.Load(other_feat, other_desc)
        break