Added NET8 compatible ONIX Hub updater

[aacuevas]

• Adds a C# .NET 8-based hub updater with GUI
• Requires clroni compiled with net8 support (built for now using https://github.com/aacuevas/liboni/tree/issue-25 built as a nuget package in a local nuget repo)
• Fixes Create a C# GUI programmer for hubs #8

[jonnew]

One thing I noticed. If I have a context opened in some other software (e.g. Bonsai or oni-repl) and attempt to program I get this exception:

Nothing crashes or anything, but perhaps the exception text could be a bit clearer.

[aacuevas]

Fixed. Now it passes the inner oni exception through.
Which when using the current liboni branch with support for NET8 is the all too familiar "Already triggered operation, but that will change to the new we made once liboni is properly merged.

[jonnew]

Another non-breaking but odd behavior:

If a connect to a headstage by pressing the "program" button on the main form, the little modal GUI pops up with an hourglass indicator. The fields then populate with the detected headstage metadata. Great.

The odd behavior is that if the mouse is not moved during this time period, the "program" and "Cancel" buttons will remain greyed out and the hourglass indicator will remain forever, until the mouse is touched.

[aacuevas]

I'll look into that but I'm not sure that is something we have control over or it's a windows forms quirk