abandon not possible everywhere + drag fixes + text fixes

common/scene_manager/scripts/scene.gd

@@ -36,4 +36,7 @@ func get_scene_icon() -> Texture:
     return DEFAULT_SCENE_ICON
 
 func _on_generated(_generated_scene : Node):
-    pass
+    pass
+
+func can_abandon() -> bool:
+    return false

common/scene_manager/scripts/scenes/cave_scene.gd

@@ -28,4 +28,7 @@ func get_scene_icon() -> Texture:
 
 func _on_generated(generated_scene : Node):
     var cave : Cave = generated_scene as Cave
-    cave.setup_room(cave_room_seed)
+    cave.setup_room(cave_room_seed)
+
+func can_abandon() -> bool:
+    return true

common/scene_manager/scripts/scenes/cockpit_scene.gd

@@ -18,4 +18,7 @@ func get_scene_title() -> String:
     return tr("INTERNODE")
 
 func get_scene_icon() -> Texture:
-    return preload("res://common/icons/rocket.svg")
+    return preload("res://common/icons/rocket.svg")
+
+func can_abandon() -> bool:
+    return true

common/scene_manager/scripts/scenes/region_scene.gd

@@ -27,4 +27,7 @@ func get_scene_title() -> String:
 
 func _on_generated(generated_scene : Node):
     var region : Region = generated_scene as Region
-    region.finish_generation()
+    region.finish_generation()
+
+func can_abandon() -> bool:
+    return true

common/scene_manager/scripts/scenes/vending_machine_scene.gd

@@ -28,4 +28,7 @@ func get_scene_icon() -> Texture:
 
 func _on_generated(generated_scene : Node):
     var vending_machine_room : VendingMachineRoom = generated_scene as VendingMachineRoom
-    vending_machine_room.setup_room(vending_machine_room_seed)
+    vending_machine_room.setup_room(vending_machine_room_seed)
+
+func can_abandon() -> bool:
+    return true