Fix bug where library wasn't actually removed when unlinking an IFC.

Previously the collection and scene object was removed, but this is
obviously not sufficient since the bpy.data.library still exists (which
meant that if you relinked it, regardless of your cache setting, it'd
just load the existing Blender file which is completely useless).

src/bonsai/bonsai/bim/module/project/operator.py

@@ -1030,7 +1030,7 @@ class LinkIfc(bpy.types.Operator):
 
 class UnlinkIfc(bpy.types.Operator):
     bl_idname = "bim.unlink_ifc"
-    bl_label = "UnLink IFC"
+    bl_label = "Unlink IFC"
     bl_options = {"REGISTER", "UNDO"}
     bl_description = "Remove the selected file from the link list"
     filepath: bpy.props.StringProperty()
@@ -1056,13 +1056,9 @@ class UnloadLink(bpy.types.Operator):
         if filepath.suffix.lower() == ".ifc":
             filepath = filepath.with_suffix(".ifc.cache.blend")
 
-        for collection in context.scene.collection.children[:]:
-            if collection.library and Path(collection.library.filepath) == filepath:
-                bpy.data.collections.remove(collection)
-
-        for scene in bpy.data.scenes[:]:
-            if scene.library and Path(scene.library.filepath) == filepath:
-                bpy.data.scenes.remove(scene)
+        for library in list(bpy.data.libraries):
+            if tool.Blender.ensure_blender_path_is_abs(Path(library.filepath)) == filepath:
+                bpy.data.libraries.remove(library)
 
         links = context.scene.BIMProjectProperties.links
         link = links.get(self.filepath)