* [Simulator] Debug output: Adjust exclusion filter, help text <kbd> background color, fix help text typos & mark as translatable.
* [Simulator] Radio Outputs: Fix wrong FM highlighted (closes#4408) and current FM not highlighted until switched once; Change highlight color role of active LS/FM so it is always shown (fixes#4393); Active LSs now much more obvious (bold font & sunken frame).
* [Simulator] Rework some SimulatorMainWindow functionality:
* Fix floating dock widgets appearing behind other applications on Linux (https://github.com/opentx/opentx/issues/4403#issuecomment-277510273);
* Fix previously-unused floating dock widgets appearing in top-left corner upon subsequent launches of application (https://github.com/opentx/opentx/pull/4385#issuecomment-277315158);
* Fix various anomalies due to not using a "central widget" in QMainWindow (extra separators appearing, vertical resize not working in some cases), radio widget is now central by default;
* Add (keep) option to float the radio widget separate from main window, though this may cause the minor visual anomalies mentioned above;
* Add options to disable radio widget size constraints while docked.
