Added rough CRT enemy; roughed in wave tracking and enemy switching; new

game resets wave_count to 0.

shaders/flash_white.gdshader

@@ -0,0 +1,18 @@
+shader_type canvas_item;
+
+uniform float flash_value : hint_range(0.0, 1.0) = 0.0;
+
+void vertex() {
+	// Called for every vertex the material is visible on.
+}
+
+void fragment() {
+    vec4 original_color = COLOR;
+    vec4 flash_color = vec4(1.0, 1.0, 1.0, 1.0); // White color
+    COLOR = mix(original_color, flash_color, flash_value);
+}
+
+//void light() {
+//	// Called for every pixel for every light affecting the CanvasItem.
+//	// Uncomment to replace the default light processing function with this one.
+//}