disposable UI; loading screen mockup (i heard like loading screen -- sonic 06)

src/net/torvald/terrarum/Ingame.kt

@@ -1530,6 +1530,14 @@ class Ingame(val batch: SpriteBatch) : Screen {
         worldBlendFrameBuffer.dispose()
         lightmapFboA.dispose()
         lightmapFboB.dispose()
+
+        actorsRenderBehind.forEach { it.dispose() }
+        actorsRenderMiddle.forEach { it.dispose() }
+        actorsRenderMidTop.forEach { it.dispose() }
+        actorsRenderFront.forEach { it.dispose() }
+
+        uiAliases.forEach { it.dispose() }
+        uiAlasesPausing.forEach { it.dispose() }
     }