This commit introduces the strategy pattern to which enables the selection of the loading algorithm at run time. In this commit the following functionality is added:
- Structure for strategy pattern.
- Single period loading implementation, which features detector grouping and good frames data calculations.

This commit creates the following:
-LoadMuonNexus3 algorithm
-LoadMuonNexus3Helper file
-LoadMuonNexus3Test file
-Adds a MuonV2 file to the test data
This commit also implements the detector grouping calculation.

These standard algorithm functions are commonly understood so the comments do not really add anything helpful

Re #26897

Re #26897

Dynamically resize wb splash screen image based on screen resolution

Settings docs update

Fix Colorfills Scaling Differently if Done From Figure Options or the Context Menu

This should resolve some of the Huge splash screens we get with the workbench sometimes.

It also means we only have to maintain one splash screen image and not two resolutions of the same thing.

This commit converts the PSIBackgroundSubtraction algorithm to a data processing algorithm. This increases the clarity and transparency of the workspace history.

In order to do this, the operator overload which removed the background has been replaced with a CreateWorkspace call, which generates a workspace based on the backgrounds obtained, followed by a call to the child algorithm "Minus".

un-capitalise and remove unnecessary plural

Co-authored-by: Conor Finn <47181718+ConorMFinn@users.noreply.github.com>

Co-authored-by: Nick Draper <nick.draper@stfc.ac.uk>

Co-authored-by: Nick Draper <nick.draper@stfc.ac.uk>

The Poco headers, and the function referencing them appear to be unused.

Updating unit tests based on changes

Move include from header to cpp file

This was noticed after #28655 was merged