Add support for Bluetooth remote for presentations

[trevorkjorlien]

Is your feature request related to a problem? Please describe.
I will be using Stellarium in a planetarium dome. I would like to give presentations in much the same way you would with Keynote or PowerPoint, advancing to the next topic.

Describe the solution you'd like
Ideally, we could connect a Bluetooth presentation remote. In a custom script, we could write "wait", which then waits for input from the remote. Then, once detected it moves forward in the script.

Describe alternatives you've considered
This issue solves this partially in a hacked way: #2920. In the scripts provided, it hacks together a "wait" for a specific key you press. Then you can advance. I've tested the scripts and they do work.

To then mimic a remote, I've used an iPhone app that simulates a keyboard and sends commands to my Mac. This is prone to a lot of error.

Additional context
Apparently, there was a function called "pauseScript", but this has been removed in recent versions of Stellarium.

[github-actions]

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[gzotti]

We don't know a way to pause a script with Qt6. This functionality is no longer available. #2920 describes a currently known hackaround.

EDIT: The current working solution is to split a presentation into parts where you would have pressed pause. You can use the web browser interface provided by the RemoteControl plugin to call scripts. You can build your custom interface for smartphone/tablet to run your own scripts triggered by buttons. There is just no more script pause function in Qt6-based builds for technical reasons, as explained in the User Guide. You can still use pause with Qt5-based builds, but there will be a time when Qt5-based builds will be left behind.

[github-actions]

Hello @trevorkjorlien!

Thank you for this suggestion.