postprocessor for 3dlut colcorr; dithering should be managed in "dirty" way

dirty way: loads dithered/passthru shader according to the game's config (boolean fxdither)

src/net/torvald/terrarum/DefaultConfig.kt

@@ -84,6 +84,13 @@ object DefaultConfig {
 
         jsonObject.addProperty("useamericanunit", false) // Metric Masterrace -- Filthy imperials.
 
+
+        // "fancy" graphics settings
+        jsonObject.addProperty("fxdither", true)
+        jsonObject.addProperty("fx3dlut", false)
+
+
+
         return jsonObject
     }
 }