Add orx-fx, the new home for what was in openrndr-filter before

orx-fx/src/main/kotlin/dither/ADither.kt

@@ -0,0 +1,25 @@
+package org.openrndr.extra.fx.dither
+
+import org.openrndr.draw.Filter
+import org.openrndr.draw.Shader
+import org.openrndr.extra.fx.filterFragmentCode
+
+
+class ADither: Filter(Shader.createFromCode(Filter.filterVertexCode, filterFragmentCode("dither/a-dither.frag"))) {
+    var pattern: Int
+        set(value) {
+            parameters["pattern"] = value
+        }
+        get() = parameters["pattern"] as Int
+
+    var levels: Int
+        set(value) {
+            parameters["levels"] = value;
+        }
+        get() = parameters["levels"] as Int
+
+    init {
+        levels = 4
+        pattern = 3
+    }
+}