Allow using QGuiApplication and not linking to QtWidgets
#408
| Job | Run time |
|---|---|
| 20s | |
| 1m 38s | |
| 1m 7s | |
| 1m 22s | |
| 1m 7s | |
| 1m 28s | |
| 2m 21s | |
| 2m 28s | |
| 2m 10s | |
| 1m 35s | |
| 2m 30s | |
| 1m 15s | |
| 2m 11s | |
| 2m 3s | |
| 2m 7s | |
| 1m 53s | |
| 1m 49s | |
| 2m 6s | |
| 31m 30s |