Added a dynamic layout system where UI elements can be moved about on a tiled grid.

scripts/layout_grid.gd

@@ -0,0 +1,27 @@
+@tool
+extends ColorRect
+
+@export var grid_size := Vector2i(32, 18):
+	set(value):
+		grid_size = value
+		if is_node_ready():
+			_update_material()
+@export var monitor_boundary := 0:
+	set(value):
+		monitor_boundary = value
+		if is_node_ready():
+			_update_material()
+
+func _ready() -> void:
+	theme_changed.connect(_update_material)
+	_update_material()
+
+func _gui_input(_event: InputEvent) -> void:
+	accept_event()
+
+func _update_material() -> void:
+	var shader_material := material as ShaderMaterial
+	shader_material.set_shader_parameter("grid_size", Vector2(grid_size))
+	shader_material.set_shader_parameter("monitor_boundary", float(monitor_boundary))
+	shader_material.set_shader_parameter("line_color", get_theme_color("instrument_grid", "SurfaceSide"))
+	shader_material.set_shader_parameter("boundary_color", get_theme_color("accent", "SurfaceSide"))