Allow using QGuiApplication and not linking to QtWidgets
#401
| Job | Run time |
|---|---|
| 4m 44s | |
| 4m 8s | |
| 4m 51s | |
| 18s | |
| 2m 35s | |
| 6m 25s | |
| 1m 11s | |
| 2m 30s | |
| 6m 24s | |
| 4m 9s | |
| 4m 8s | |
| 2m 9s | |
| 3m 53s | |
| 3m 52s | |
| 3m 52s | |
| 3m 52s | |
| 3m 53s | |
| 3m 54s | |
| 3m 53s | |
| 1h 10m 41s |