Compiler: Register the ref module

Author: hexaredecimal

src/main/java/org/piccode/backend/Compiler.java

@@ -37,6 +37,7 @@
 import org.piccode.rt.modules.PiccodeMathModule;
 import org.piccode.rt.modules.PiccodeObjectModule;
 import org.piccode.rt.modules.PiccodeProcModule;
+import org.piccode.rt.modules.PiccodeRefModule;
 import org.piccode.rt.modules.PiccodeStringModule;
 import org.piccode.rt.modules.PiccodeSystemModule;
 import org.piccode.rt.modules.PiccodeTimeModule;
@@ -288,6 +289,7 @@ private static void addSystemFunctions() {
 		addNativeFunctions(PiccodeFsModule::addFunctions);
 		addNativeFunctions(PiccodeObjectModule::addFunctions);
 		addNativeFunctions(PiccodeProcModule::addFunctions);
+		addNativeFunctions(PiccodeRefModule::addFunctions);
 
 		Context.addAnnotation("Deprecated", (frame, node) -> {
 			var warning = new PiccodeWarning(node.file, node.line, node.column, "Invocation of a deprecated function");