TOPPView Preferences Dialog refactor

[cbielow]

Description

Expose TSG parameters in TOPPView preferences and make parameter handling less manual.
Still, we should replace the whole TV Pref dialog with a ParamEditor at some point, because there are many points of failure ATM.
But this needs some more features in ParamEditor first, e.g. editing of ColorGradients.

also in this PR:
Some code renaming and documentation.

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