create constructors for VmcMessageNoArgs

src/lib.rs

@@ -1976,7 +1976,7 @@ impl VmcExtSetConfig {
 }
 
 #[derive(Debug)]
-struct VmcMessageNoArgs {
+pub struct VmcMessageNoArgs {
     addr: String
 }
 
@@ -1995,6 +1995,18 @@ impl VmcMessage for VmcMessageNoArgs {
     }
 }
 
+impl VmcMessageNoArgs {
+    pub fn new(addr: String) ->MsgNewResult<Self> {
+        Ok(Self { addr })
+    }
+    pub fn new_vmc_message(addr: String) -> TraitMsgNewResult {
+        match Self::new(addr) {
+            Ok(val) => Ok(Box::new(val)),
+            Err(val) => Err(val),
+        }
+    }
+}
+
 pub fn from_osc_message(msg: OscMessage) -> Result<Box<dyn VmcMessage>, FromMessageErr> {
     match msg.addr.as_str() {
         "/VMC/Ext/OK" => VmcExtOk::from_osc_message(msg),