Extcap: Extcaps must be fully configured before start of capture
When capture is started from the toolbar menu, no checks of extcap setting are made.
Patch adds check of all selected extcaps before start of capture. If extcap is not configured, extcap config dialog is shown for every unconfigured extcap. Start of capture is canceled and a user must start it again.
Changes:
- added check to MainWindow::startCapture()
- extcap options dialog shows Save or Start button, calling adapted
Fixes #13663 (closed)