Add icons to all demos that can have a meaningful one

2d/fog_of_war/icon.png.flags

@@ -1 +0,0 @@
-gen_mipmaps=true

2d/lookat/engine.cfg

@@ -2,3 +2,4 @@
 
 name="Look At Pointer"
 main_scene="res://lookat.scn"
+icon="res://icon.png"

2d/motion/engine.cfg

@@ -2,6 +2,7 @@
 
 name="Motion Test"
 main_scene="res://motion.scn"
+icon="res://icon.png"
 
 [display]
 

2d/texscreen/engine.cfg

@@ -2,6 +2,7 @@
 
 name="Glass Bubbles (Texscreen)"
 main_scene="res://bubbles.scn"
+icon="res://icon.png"
 
 [display]
 

3d/truck_town/engine.cfg

@@ -2,6 +2,7 @@
 
 name="Truck Town"
 main_scene="res://car_select.scn"
+icon="res://icon.png"
 
 [display]
 

gui/drag_and_drop/engine.cfg

@@ -2,3 +2,4 @@
 
 name="Drag & Drop (GUI)"
 main_scene="res://drag_and_drop.scn"
+icon="res://icon.png"

gui/input_mapping/engine.cfg

@@ -2,6 +2,7 @@
 
 name="Input Mapping GUI"
 main_scene="res://controls.scn"
+icon="res://icon.png"
 
 [display]
 

gui/translation/engine.cfg

@@ -2,6 +2,7 @@
 
 name="Translation Demo"
 main_scene="res://main.scn"
+icon="res://icon.png"
 
 [locale]
 

misc/regex/engine.cfg

@@ -2,3 +2,4 @@
 
 name="RegEx"
 main_scene="res://regex.scn"
+icon="res://icon.png"

misc/window_management/icon.png.flags

@@ -1 +0,0 @@
-gen_mipmaps=false

viewport/3d_in_2d/engine.cfg

@@ -2,3 +2,4 @@
 
 name="3D in 2D"
 main_scene="res://main.scn"
+icon="res://icon.png"

viewport/gui_in_3d/engine.cfg

@@ -2,3 +2,4 @@
 
 name="GUI in 3D"
 main_scene="res://gui_3d.scn"
+icon="res://icon.png"

viewport/screen_capture/engine.cfg

@@ -2,6 +2,7 @@
 
 name="Screen Capturing"
 main_scene="res://screen_capture.scn"
+icon="res://icon.png"
 
 [display]