New Demo, Screen Space Shaders

-Fixes to screen space shaders.
-Fixes to isometric light demo.

demos/2d/screen_space_shaders/art/filmgrain.png.flags

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+repeat=true

demos/2d/screen_space_shaders/engine.cfg

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+[application]
+
+name="Screen-Space Shaders"
+main_scene="res://screen_shaders.scn"

demos/2d/screen_space_shaders/screen_shaders.gd

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+
+extends Control
+
+# member variables here, example:
+# var a=2
+# var b="textvar"
+
+func _ready():
+	# Initialization here
+	for c in get_node("pictures").get_children():
+		get_node("picture").add_item("PIC: "+c.get_name())
+	for c in get_node("effects").get_children():
+		get_node("effect").add_item("FX: "+c.get_name())
+	pass
+
+
+
+
+func _on_picture_item_selected( ID ):
+	for c in range(get_node("pictures").get_child_count()):
+		if (ID==c):
+			get_node("pictures").get_child(c).show()
+		else:
+			get_node("pictures").get_child(c).hide()
+
+
+func _on_effect_item_selected( ID ):
+	for c in range(get_node("effects").get_child_count()):
+		if (ID==c):
+			get_node("effects").get_child(c).show()
+		else:
+			get_node("effects").get_child(c).hide()