8536cd794e
Use the current Action API (i.e. move away from the to-be-deleted-in-5.0 one) to import and export F-Curves from/to FBX files. There is a slight difference in functionality for the exporter, in the selection of which Actions to export for the "All Actions" option. This is just a minimal change to ensure the legacy API is no longer used. Old: `action.fcurves` was iterated, and if all FCurves could resolve to existing properties, the Action was exported. This would only work reliably for single-slotted Actions, due to the use of the deprecated `action.fcurves` property. New: the above check is done for each Channelbag in the Action. The first Channelbag that match the above check is exported. This does _not_ export all suitable channelbags; it merely improves on the old behaviour slightly. The new, C++-based FBX exporter is more feature-complete in this regard. This is part of #146586
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