tiny fixes

[panno8M]

• add overwrite attribute
• add order or priority attribute
• rename materials/ to badges/
• integrate with gdextwiz

godot-nim/gdext-nim#8

[insomniacUNDERSCORElemon]

To be clear, yeah I went with order in my comment because to me that seems to sidestep the interpretation issue of level/intensity versus rank that priority potentially has.

[insomniacUNDERSCORElemon]

You know, I guess order isn't even really needed if I just rename it to something like ze_default_badge.svg. Or do as I've said in another comment and use number prefixes 00 to 99 (even just 0..9 would likely be useful enough for most projects considering more than one file can be processed per number, as many per-layer as one can get working without file conflicts and even that is just making the workflow* obvious).

*= generally: no conflicts first, then fill in more w/o overwrite, then targeted overwrite fixes, lastly fill in everything missing w/o overwrite. More layers may be introduced as needed, especially steps 2/3, particularly for more orientations of badge (ones that may make less sense, but may be needed for readability of some icons).