Add spine and dialogic museums

docs/museums/spine/examples/01-helloworld/helloworld.tscn

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+[gd_scene format=3 uid="uid://d0v5rhv2ysej8"]
+
+[ext_resource type="SpineSkeletonDataResource" uid="uid://cb6rn6vonqbx0" path="res://docs/museums/spine/assets/spineboy/spineboy-data-res.tres" id="3"]
+
+[node name="Node2D" type="Node2D" unique_id=1221230663]
+
+[node name="Spineboy" type="SpineSprite" parent="." unique_id=538013976]
+skeleton_data_res = ExtResource("3")
+bones_color = Color(0.968627, 1, 0, 0.501961)
+paths_color = Color(1, 0.498039, 0, 0.466667)
+paths_clipping = Color(0.8, 0, 0, 0.5)
+preview_skin = "Default"
+preview_animation = "-- Empty --"
+preview_frame = false
+preview_time = 0.0
+position = Vector2(505, 466)
+scale = Vector2(0.466832, 0.466832)

docs/museums/spine/examples/01-helloworld/spineboy-helloworld.gd

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+extends SpineSprite
+
+func _ready():
+	get_animation_state().set_animation("walk", true, 0)

docs/museums/spine/examples/01-helloworld/spineboy-helloworld.gd.uid

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+uid://bqoowjvbanswg