Fix demo picker blank scene

It did not have a file path by default, but had an index.
Also, the camera on Seek/Flee caused the Go Back button not to show.
The scene's been amended and the camera removed, since it wasn't
actually useful.

project/demos/DemoPickerUI.gd

@@ -14,6 +14,7 @@ func _ready() -> void:
 	list.connect("demo_selected", self, "set_demo_path")
 	list.connect("item_activated", self, "emit_signal", ["demo_requested"])
 	button.connect("pressed", self, "emit_signal", ["demo_requested"])
+	demo_path = list.file_paths[0]
 
 
 func set_demo_path(value: String) -> void:

project/demos/PursueSeek/PursueAndSeekDemo.tscn

@@ -8,7 +8,6 @@
 [ext_resource path="res://demos/Utils/Line2DDraw.gd" type="Script" id=6]
 [ext_resource path="res://assets/sprites/background.png" type="Texture" id=7]
 
-
 [node name="PursueVSSeekDemo" type="Node2D"]
 script = ExtResource( 4 )
 __meta__ = {

project/demos/SeekFlee/Player.gd

@@ -3,7 +3,11 @@ extends KinematicBody2D
 
 
 var speed: float
-var agent := GSTAgentLocation.new()
+onready var agent := GSTAgentLocation.new()
+
+
+func _ready() -> void:
+	agent.position = GSTUtils.to_vector3(global_position)
 
 
 func _physics_process(delta: float) -> void:
@@ -12,7 +16,7 @@ func _physics_process(delta: float) -> void:
 		return
 	
 	move_and_slide(movement * speed)
-	agent.position = Vector3(global_position.x, global_position.y, 0)
+	agent.position = GSTUtils.to_vector3(global_position)
 
 
 func _get_movement() -> Vector2:

project/demos/SeekFlee/SeekFleeDemo.gd

@@ -31,8 +31,8 @@ func _ready() -> void:
 	
 	for i in range(spawner.entity_count):
 		var new_pos := Vector2(
-				rng.randf_range(-camera_boundaries.size.x/2, camera_boundaries.size.x/2),
+				rng.randf_range(0, camera_boundaries.size.x),
-				rng.randf_range(-camera_boundaries.size.y/2, camera_boundaries.size.y/2)
+				rng.randf_range(0, camera_boundaries.size.y)
 		)
 		var entity: KinematicBody2D = spawner.Entity.instance()
 		entity.global_position = new_pos

project/demos/SeekFlee/SeekFleeDemo.tscn

@@ -31,10 +31,8 @@ layer = -1
 texture = ExtResource( 8 )
 centered = false
 
-[node name="Camera2D" type="Camera2D" parent="."]
-current = true
-
 [node name="Player" type="KinematicBody2D" parent="."]
+position = Vector2( 512, 300 )
 collision_mask = 2
 script = ExtResource( 2 )
 
@@ -46,7 +44,7 @@ outer_color = Color( 0.560784, 0.870588, 0.364706, 1 )
 stroke = 4.0
 
 [node name="LeftBoundary" type="StaticBody2D" parent="."]
-position = Vector2( -512, 0 )
+position = Vector2( 0, 300 )
 collision_layer = 2
 collision_mask = 5
 script = ExtResource( 1 )
@@ -55,7 +53,7 @@ script = ExtResource( 1 )
 shape = SubResource( 2 )
 
 [node name="RightBoundary" type="StaticBody2D" parent="."]
-position = Vector2( 512, 0 )
+position = Vector2( 1024, 300 )
 collision_layer = 2
 collision_mask = 5
 script = ExtResource( 1 )
@@ -64,7 +62,7 @@ script = ExtResource( 1 )
 shape = SubResource( 2 )
 
 [node name="TopBoundary" type="StaticBody2D" parent="."]
-position = Vector2( 0, -300 )
+position = Vector2( 512, 0 )
 collision_layer = 2
 collision_mask = 5
 script = ExtResource( 1 )
@@ -73,7 +71,7 @@ script = ExtResource( 1 )
 shape = SubResource( 3 )
 
 [node name="BottomBoundary" type="StaticBody2D" parent="."]
-position = Vector2( 0, 300 )
+position = Vector2( 512, 600 )
 collision_layer = 2
 collision_mask = 5
 script = ExtResource( 1 )
@@ -85,9 +83,7 @@ shape = SubResource( 3 )
 script = ExtResource( 4 )
 Entity = ExtResource( 6 )
 
-[node name="CanvasLayer" type="CanvasLayer" parent="."]
+[node name="GUI" type="PanelContainer" parent="."]
-
-[node name="GUI" type="PanelContainer" parent="CanvasLayer"]
 margin_right = 1024.0
 margin_bottom = 116.0
 theme = ExtResource( 5 )
@@ -95,11 +91,11 @@ __meta__ = {
 "_edit_use_anchors_": false
 }
 
-[node name="MarginContainer" type="MarginContainer" parent="CanvasLayer/GUI"]
+[node name="MarginContainer" type="MarginContainer" parent="GUI"]
 margin_right = 1024.0
 margin_bottom = 116.0
 
-[node name="RichTextLabel" type="RichTextLabel" parent="CanvasLayer/GUI/MarginContainer"]
+[node name="RichTextLabel" type="RichTextLabel" parent="GUI/MarginContainer"]
 margin_left = 16.0
 margin_top = 16.0
 margin_right = 1008.0