Layer refactor: StatisticsDialog

[cbielow]

Description

The primary reason for creating the PR was:

• replace manual switching of layer type with Visitor pattern, e.g. get rid of

  OpenMS/src/openms_gui/source/VISUAL/DIALOGS/LayerStatisticsDialog.cpp

  Line 59 in 5ebaf1d

  else if (layer_data_.type == LayerDataBase::DT_FEATURE)

  and the manual hacking of the table in there

However, this required in turn to:

• cleanup of LayerStatistics (separate model from view)

And while at it ...

• visualization improvements (show ints as ints, not as doubles; add subheaders for different data sources (meta vs. dataarrays vs. core)

Before:

After:

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[cbielow]

test pass (even though status says otherwise).

Any comments?