Nexxt

- disable mouse wheel scrolling for main window's viewport
- always use full C locale (instead of using just the number options)
- when re-opening the currently open config file, the gui state is now restored properly (issue 38)
- add a reload button for reloading the configuration's python modules (issue 9)
- improved copy&paste handling of file browser widget (issue 24)
- GenericReader now providses a property for the selection of the default step stream (issue 39)

Fix https://github.com/ifm/nexxT/issues/37

- fix increased latency https://github.com/ifm/nexxT/issues/33 (see https://github.com/ifm/nexxT/pull/34).
+ thread cycles are no longer supported by nexxT because they might cause deadlocks, existing configurations might need to be changed
+ revert to depth first search strategy (pre 0.6.0 behaviour)
+ reduce number of data sample instances which are buffered in QT events
- fix https://github.com/ifm/nexxT/issues/32 (Changing a filter's thread does not set the dirty flag of the configuration)
+ the save action is now enabled/disabled according to the dirty flag.

- Update to PySide2 5.15.1
- fix issue https://github.com/ifm/nexxT/issues/25 (Possible deadlock)
- as a side effect, the computational graph is now traversed in a breadth first instead of depth first strategy
- fix issue https://github.com/ifm/nexxT/issues/28 (Playback stream selection is ignored)
- fix issue https://github.com/ifm/nexxT/issues/29 (Better usability for Windows menu)
- the windows menu behaviour has changed, clicking on a window now always raises and scrolling to it.
- Remove QDoubleValidator from property editors because of strange behaviour
- Add CTRL-I and CTRL-D shortcuts for initializing / de-initializing applications
- call Service's detach() slots before removing them, if available
- avoid too large "About python" dialog
- add feature to communicate selected points over QMainWindow

- Redesign of harddisk player, introduce GenericReader for better support of different file formats
- Documentation updates