abstract websocket to allow additional transport layers

cvmts/src/NetworkClient.ts

@@ -0,0 +1,8 @@
+export default interface NetworkClient {
+    getIP() : string;
+    send(msg: string) : Promise<void>;
+    close() : void;
+    on(event: string, listener: (...args: any[]) => void) : void;
+    off(event: string, listener: (...args: any[]) => void) : void;
+    isOpen() : boolean;
+}