[refactor] add namespace 'crossdesk' to codebase

src/gui/render_callback.cpp

@@ -11,6 +11,8 @@
 #define MOUSE_CONTROL 1
 #endif
 
+namespace crossdesk {
+
 int Render::SendKeyCommand(int key_code, bool is_down) {
   RemoteAction remote_action;
   remote_action.type = ControlType::keyboard;
@@ -542,4 +544,5 @@ void Render::NetStatusReport(const char* client_id, size_t client_id_size,
   if (!(render->peer_reserved_ && !strstr(client_id, "C-"))) {
     props->net_traffic_stats_ = *net_traffic_stats;
   }
-}
+}
+}  // namespace crossdesk