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/lod/plugin.gd

@@ -1,7 +1,7 @@
+@tool
 # Copyright © 2020 Hugo Locurcio and contributors - MIT License
 # See `LICENSE.md` included in the source distribution for details.
 #
 # This script is needed to make the `class_name` script visible in the Create New Node dialog
 # once the plugin is enabled.
-tool
 extends EditorPlugin