Major overhaul of scene transitions and game over

ScrollText.gdshader

@@ -0,0 +1,13 @@
+shader_type canvas_item;
+uniform sampler2D ColourTexture;
+uniform vec2 rect_global_position; 
+uniform vec2 rect_size;
+
+void vertex() {
+}
+
+void fragment() {
+	vec2 actual_uv = (SCREEN_UV - rect_global_position) * rect_size;
+	COLOR *= texture(ColourTexture, actual_uv);
+}
+