Added support for stream rate config to MAVLink inspector. Allows to con...

...figure the update rate per message. @DrTon This is what you have been waiting for 8). You need to select a system and component ID in the message inspector widget, then a dialog shows up that allows to configure the rates.

Need to implement get rate support and display of the current rates - but this widget will already allow to configure rates and will probably be helpful during development.