message: Include OS and UE version details in the UA.
diff: #include "HttpModule.h"
  #include "Interfaces/IHttpRequest.h"
  #include "Interfaces/IHttpResponse.h"
  +#include "Misc/EngineVersion.h"
  #include "UnrealConversions.h"
  #include <cstddef>
  #include <optional>
  @@ -94,12 +95,14 @@ UnrealAssetAccessor::UnrealAssetAccessor() : _userAgent() {
  FString OsVersion, OsSubVersion;
  FPlatformMisc::GetOSVersions(OsVersion, OsSubVersion);
  - FString projectName = FApp::GetProjectName();
  -
  this->_userAgent = TEXT("Mozilla/5.0 (");
  this->_userAgent += OsVersion;
  + this->_userAgent += " ";
  + this->_userAgent += FPlatformMisc::GetOSVersion();
  this->_userAgent += TEXT(") Cesium For Unreal/1.0.0 (Project ");
  - this->_userAgent += projectName;
  + this->_userAgent += FApp::GetProjectName();
  + this->_userAgent += " Engine ";
  + this->_userAgent += FEngineVersion::Current().ToString();
  this->_userAgent += TEXT(")");
  }
  