Refs #6473. New class for the dialog.
Refs #6473. Enabled Sequential fit option for Muon Analysis.

The new dialog is shown when it is clicked.
Refs #6473. Initial UI file for the dialog.
Refs #6473. Hide label for MWRunFiles widget if it is empty.
Refs #6473. Basic elements for the UI form.
Refs #6473. Validation of label.
Refs #6473. Single button for start/stop functinality.

Can just change the text when stopped/running.
Refs #6473. Enabling/disabling start button on input change.
Refs #6473. Renamed member variable according to rules.
Refs #6473. Better function name.
Refs #6473. Control button logic.
Refs #6473. Improved inputs alignment.
Refs #6473. Disabling input widgets when running.
Refs #6473. Initializing the diagnosis table.

Columns for all the parameters are added.
Refs #6473. Initial functionality of running/stopping.

Fitting itself is not done yet, is simulated by just loading files for
now.
Refs #6473. FitPropertyBrowser: make method public.

This is quite a useful method for leaving decision on which function
exactly to use for fit to the property browser.
Refs #6473. Function for getting run title from workspace.
Refs #6473. Using better way to get fitting function.
Refs #6473. Setting initial values for inputs.
Refs #6473. Minor refactoring.