Interactive onboarding dialog

[jonpalmisc]

The onboarding dialog in its current form is strictly informational. However, it would be a good place to allow users to configure settings they might like to configure if they are using Binary Ninja for the first time. Potential setting candidates include:

• Update cadence (and enable/disable auto-updates)
• Keybindings
• Theme
• Window layout

[psifertex]

The updated onboarding should be a tab and not a separate dialog. This makes it far easier to simply ignore if people choose, it doesn't get in the way as much, and we can even make it stay as the default unless disabled if we wanted.

[psifertex]

We should also consider importing "recent files" from Ghidra/IDA as a part of the migration path. That feature is predicated on #2919 and #2918

[psifertex]

This is in testing internally. Using this issue to solicit ideas/track settings that people would like to be included. You can see the exposed settings via:

https://github.com/Vector35/binaryninja-api/tree/test_onboarding_wizard/docs/files

Notice that it contains json files which define which qsettings (or binja settings) that will be set by default when that option is selected during the onboarding wizard.