Items with an unrecognised type are now ignored when publishing.
Previously, if an item returned from the scan hook was of a type not listed in a secondary publish, the publish would not be allowed.  Now these are just ignored and publishing of other valid items can continue.
For #25984 - Added Alembic publish as default secondary publish for Maya
- All geometry in scene will be published as a single Alembic cache
- This will require configuration changes to work correctly.
For #25950 - Added publish hooks for Mari texture export
- Supports both flattened channels and layers
- Default thumbnail is taken from the current canvas
- There is currently no primary publish
Fixed wierd resizing bug in task item list
Updated icons graffle and changed it to be a compressed flat file.