Implement a UI file for the main view
Add interface definition for the view
Create structure for the widget

This commit does the following things:

(1) Sets the parent of the Muon Analysis GUI to be the main workbench window. This prevents the external plot sending the interface to the back.

(2) Moves the number_of_axes variable to the view.

(3) Adds in an external plotting button within the Plotting Widget View.

(4) Creates an external plotting model view class. This class delegates to either workbench, or mantidplot based plotting.

(5) Adds unit tests for the new feature

Fix error introduced in rebase

This commit does the following things:

(1) Sets the parent of the Muon Analysis GUI to be the main workbench window. This prevents the external plot sending the interface to the back.

(2) Moves the number_of_axes variable to the view.

(3) Adds in an external plotting button within the Plotting Widget View.

(4) Creates an external plotting model view class. This class delegates to either workbench, or mantidplot based plotting.

(5) Adds unit tests for the new feature

This commit adds the option for the full crystallographic density to powder SampleDensity

re: #28418

To facilitate future changes a custom table widget was implemented in the sequential fitting tab. This should enable log data to be easily added to the table.
Fix flake8 errorrr

This change makes it so tiled plots and data loading signals update the plots  in a smart way (e.g does not replot all the data if we are on the fitting tab)

Reintroduced a fit selected button
Sequential fit will fit all workspaces, and then select the last one to display.
Added custom parameter item, to  prevent string inputs, which cause errors for mantid.

Handling focus out event

Add in custom table widget to allow for new signals

This commit adds the option for the fourier filter in polaris pdf to be performed using the butterworth filter in FFTSmooth.

re: #28417

This Commit fixes failing system tests in ISIS powder polaris.

re: #28415

The status bar at the bottom of the GUI is now populated with the
currently loaded calibration.