CC-by-SA 4.0 for media and everything else

- All skins are registered in skinsdb, including skins format
- But the skins are not in inventory skins list, still available trough wardrobe only
- If selected, the skins metadata and preview is shown in inventory
- Use skinsdb method to set the skin
- Note: skinsdb manages the 3d_armor if both mods found

There are 3 false positives remaining after this patch, so
the bulk of the issues are fixed now.

and rename the base wood to _plain instead of beech