Change log of version 2.2.7.9

VideoOAEwo

Adding support for frameDecoderTick-Events, for alive monitoring of video decoding in VideoWidget.

Fixing to only use one recording as target, while configuration of failover-recording with equal hosts.
Adding support for Maintenance-Mode.
Adding support for new host-Logic in vimacc for the stream info, instead of using the controller.

Under Linux Adding "max open files" limit to 100000 to avoid "too many open files" errors. Add LimitNOFILE=100000 entry to AccVimaccService*.service.
Fixing to install admin tools, add AccVimaccSign to all options.
FIXED "cmd=show" config request command ignored the "overridecolor" parameter.
- Example: Show "Autobahn 1" live stream on panel 1 with override color frame ("blue" by default)
- ActiveDeviceList/ws_workstation_0001/command/request = cmd=show;source=cam_demostreams_autobahn1_0001;videodlg=VD1;overridecolor=true
Adding support to push login credentials to AccVimaccPlayback by command line.

This is usable, when vimacc is running integrated into a central management system, with extended Export handling and PasswordStore-Manegement, e.g. in Traffic Control Centers
- - where the Credentials for the exports are management by the GDPR-Manager and any export is done to a central NAS
- - the operators are not allowed to know the credentials for the export, but should review them, as long as they are placed within the central system. For this the operators has play buttons on the export list, which starts the ExportPlayer, with right credentials from the Passwort-Store.
Fixing leaking socket instances, which cause misbehaviors, like left behind AccVimaccWorkstation instances (visible in TaskManager only)