deprecate old projects & reduce CI workload

projects/_deprecated/flixel-rpg-tutorial/source/Coin.kiss

@@ -0,0 +1,18 @@
+(method new [:Float x :Float y]
+    (super x y)
+    (loadGraphic AssetPaths.coin__png false 8 8))
+
+(method &override :Void kill []
+    (set alive false)
+    (FlxTween.tween
+        this
+        (object
+            alpha 0
+            y (- y 16))
+        0.33
+        (object
+            ease FlxEase.circOut
+            onComplete finishKill)))
+
+(method finishKill [_]
+    (set exists false))