center method for icon

Author: brachy84

src/main/java/com/cleanroommc/modularui/drawable/Icon.java

@@ -92,6 +92,10 @@ public Icon alignment(Alignment alignment) {
         return this;
     }
 
+    public Icon center() {
+        return alignment(Alignment.Center);
+    }
+
     public Icon color(int color) {
         this.color = color;
         return this;