Used slightly different approach. This tab is fully build in source code
using subclasses to adjust behaviour of widgets for reuse in the other tabs.
Uses custom proxy model for filtering triggers for correct table and supporting
out of the box sorting by QTableView.
SqlCodePreview: QPlainTextEditor which sql highlighter and in readonly mode but allows copy.
model is reset as this will clear all selections.
Unfortunatly the selection model does not trigger a selectionChanged when
the model is reset.
Close#16
