feat: Add encoderhero and heroscript_dumps/loads

- Add encoderhero import to multiple modules
- Implement heroscript_dumps and heroscript_loads functions
- Update several methods to use `if mut` for cleaner optionals
- Rename rclone globals for clarity

lib/clients/mycelium_rpc/mycelium_rpc.v

@@ -44,6 +44,11 @@ fn (mut t HTTPTransport) send(request string, params jsonrpc.SendParams) !string
 	return response
 }
 
+// url implements the IRPCTransportClient interface
+fn (t HTTPTransport) url() string {
+	return t.http_conn.base_url
+}
+
 // Admin methods
 
 // get_info gets general info about the node