Fix packed scene translation parser missing strings.

[Kiisu-Master]

This is my attempt to fix the POT generator missing strings.

• Made a special case for when the node type is empty, it will open the scene and get the type from there. It might even make sense to parse the whole instanced scene too, but it's possible to work around by just adding it to the files list.
  (fixes Localization POT generation does not regognize text on instanced nodes. #74194, probably fixes POT generation with saved scenes loaded from another scene doesn't work #79144)
• Removed the MenuButton and OptionButton case, as it's attempting to parse the old 3.x scene format.
• Added a function that will tell if the property of the node should be included. It will now match the property name against all properties in the lookup list, which allows wildcard for popup/item_0/text property of the nodes with popup menus.
  (fixes Menu- and OptionButton item text strings don't get included in POT generation #88017)

I'm planning to add the lookup and exclude properties in the project settings, but i don't know how to do that yet.
This is my first time really working with c++ so i have no idea really what im doing.
It might be that the variable names im using are wrong.
I ported this code from a custom translation parser i made in gdscript.

[YeldhamDev]

It might even make sense to parse the whole instanced scene too

I would recommend against that, since it could lead to parsing of unwanted strings. 😉

Overall, nice job!

[Kiisu-Master]

It might even make sense to parse the whole instanced scene too

I would recommend against that, since it could lead to parsing of unwanted strings. 😉

Overall, nice job!

BTW the same could happen with the inclusion of all *_text properties. It will include more strings from nodes inheriting AcceptDialog, but also user created nodes which might use this name ending for other purposes. I know there is some properties that end with _text that arent strings, but that's taken care of with the type check. I hope it doesn't cause problems.

[akien-mga]

Thanks! And congrats for your first merged Godot contribution 🎉