GOOENGINE: UI QoL changes

Patches originally written by Joseph and Thorn. Thank you!

Adds the film transparent checkbox to the world panel for easy access
Puts the Topology Mirror boolean as a button next to the axis
Adds the scene camera selector to the top bar for easy access

scripts/startup/bl_ui/properties_world.py

@@ -122,7 +122,8 @@ class EEVEE_WORLD_PT_surface(WorldButtonsPanel, Panel):
         layout = self.layout
 
         world = context.world
-
+        
+        rd = context.scene.render
         layout.prop(world, "use_nodes", icon='NODETREE')
         layout.separator()
 
@@ -143,6 +144,8 @@ class EEVEE_WORLD_PT_surface(WorldButtonsPanel, Panel):
         else:
             layout.prop(world, "color")
 
+        layout.prop(rd, "film_transparent", text="Transparent")
+
 
 class EEVEE_WORLD_PT_volume(WorldButtonsPanel, Panel):
     bl_label = "Volume"

scripts/startup/bl_ui/space_topbar.py

@@ -50,6 +50,7 @@ class TOPBAR_HT_upper_bar(Header):
             layout.template_running_jobs()
 
         # Active workspace view-layer is retrieved through window, not through workspace.
+        layout.prop(scene, "camera", text="", icon='CAMERA_DATA')
         layout.template_ID(window, "scene", new="scene.new", unlink="scene.delete")
 
         row = layout.row(align=True)

scripts/startup/bl_ui/space_view3d.py

@@ -155,6 +155,7 @@ class VIEW3D_HT_tool_header(Header):
             sub.prop(ob, "use_mesh_mirror_x", text="X", toggle=True)
             sub.prop(ob, "use_mesh_mirror_y", text="Y", toggle=True)
             sub.prop(ob, "use_mesh_mirror_z", text="Z", toggle=True)
+            sub.prop(context.object.data, "use_mirror_topology", text="T", toggle=True)
             if mode_string == 'EDIT_MESH':
                 layout.prop(tool_settings, "use_mesh_automerge", text="")
             elif mode_string == 'PAINT_WEIGHT':