GUI: Replace DoubleEditor and ScientificDoublePropertyEditor with ScientificSpinBox
|Status:||Backlog||Start date:||05 Dec 2018|
ScientificSpinBox has an advantage of better handling property limits,
e.g. in case of positive value it will forbid to type in zero value.
Moreover, it is compatible with default QStyledItemDelegate machinery,
which will simplify the code of SessionModelDelegate.