Add velocity HUD display (Velocity: 0) in top-left corner

src/UiManager.cpp

@@ -903,7 +903,6 @@ namespace ZL {
 	bool UiManager::setText(const std::string& name, const std::string& newText) {
 		auto tv = findTextView(name);
 		if (!tv) {
-			std::cerr << "TextView not found: " << name << std::endl;
 			return false;
 		}
 		tv->text = newText;