Run godot --convert-3to4 (automated conversion)

Apply Godot 4.6 automated conversion: renames Spatial.translate->position,
margin_*->offset_*, tool->@tool, .empty()->.is_empty(), DynamicFont->FontFile,
onready->@onready, export()->@export, and many more.

127 files changed by the tool. Manual fixes still required for:
 - godot_db_manager plugin (incompatible APIs: WindowDialog, Tabs, etc.)
 - lod plugin (Spatial -> Node3D renames)
 - ResourceLoader.load_interactive removed -> load_threaded_request
 - OS.set_window_fullscreen removed -> DisplayServer
 - Viewport.set_size_override removed

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

addons/godot_db_manager/dlgs/data_dlg.gd

@@ -1,10 +1,10 @@
+@tool
 """
 class GDDBDataPanel
 """
 
 class_name GDDBDataPanel
 
-tool
 extends PopupPanel
 
 signal select_data
@@ -16,8 +16,8 @@ var m_table = null
 
 # Called when the node enters the scene tree for the first time.
 func _ready():
-	connect("about_to_show", self, "on_about_to_show")
-	$ItemList.connect("item_selected", self, "on_item_selected")
+	connect("about_to_popup", Callable(self, "on_about_to_show"))
+	$ItemList.connect("item_selected", Callable(self, "on_item_selected"))
 
 # sets property id
 func set_prop_id(prop_id : int) -> void :