[DList Viewer] Add "Show Coordinates" feature

[Dragorn421]

Many actors use hardcoded coordinates in model space

For example boss gohma from oot: https://github.com/zeldaret/oot/blob/d95639b993f94a924d2ab66e15efc32fb633c669/src/overlays/actors/ovl_Boss_Goma/z_boss_goma.c#L2038

It would be helpful to have a "Show Coordinates" button in the Display List Viewer where you can input x,y,z coordinates, and it creates some kind of marker at that spot (possibly focusing the camera on it too)

The same thing could be useful in Skeleton Viewer, with the added option of attaching the marker to a limb so it is deformed with the skeleton

Another example with oot's bombchu actor

https://github.com/zeldaret/oot/blob/ed78d18a256ae941d2e821b14e17fb558703775d/src/overlays/actors/ovl_En_Bom_Chu/z_en_bom_chu.c#L361

This is how I investigate these currently within Blender (note: Blender's coordinate system is +z up, not oot's +y up)