Added Patterns for the bucket tool

The bucket tool can now use Patterns instead of colors to fill areas. They get loaded from the "Patterns" folder, similar to how Brushes and Palletes work. You can no longer use brushes for the bucket tool.

Prefabs/PatternButton.gd

@@ -0,0 +1,22 @@
+extends TextureButton
+
+
+var image : Image
+var texture : ImageTexture
+
+
+func _ready():
+	if image:
+		texture = ImageTexture.new()
+		texture.create_from_image(image, 0)
+
+
+func _on_PatternButton_pressed() -> void:
+	if Global.pattern_window_position == "left":
+		Global.pattern_left_image = image
+		Global.left_fill_pattern_container.get_child(0).get_child(0).texture = texture
+
+	elif Global.pattern_window_position == "right":
+		Global.pattern_right_image = image
+		Global.right_fill_pattern_container.get_child(0).get_child(0).texture = texture
+	Global.patterns_popup.hide()

Prefabs/PatternButton.tscn

@@ -0,0 +1,27 @@
+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://Assets/Graphics/Brush_button.png" type="Texture" id=1]
+[ext_resource path="res://Prefabs/PatternButton.gd" type="Script" id=2]
+
+[node name="PatternButton" type="TextureButton"]
+margin_right = 32.0
+margin_bottom = 32.0
+rect_min_size = Vector2( 3, 0 )
+button_mask = 7
+texture_normal = ExtResource( 1 )
+stretch_mode = 5
+script = ExtResource( 2 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="PatternTexture" type="TextureRect" parent="."]
+margin_right = 32.0
+margin_bottom = 32.0
+rect_min_size = Vector2( 32, 32 )
+expand = true
+stretch_mode = 6
+__meta__ = {
+"_edit_use_anchors_": false
+}
+[connection signal="pressed" from="." to="." method="_on_PatternButton_pressed"]