Add a compilable stub of RenameWorkspaces re #6983

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Declare RenameWorkspaces Properties appropriately re #6983

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Add check of RenameWorkspaces properties re #6983

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Begin unit test RenameWorkspacesTest.h re #6983

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Add unit test for invalid arguments re #6983

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Add guts of RenameWorkspaces and extend unit test re #6983

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Merge branch 'feature/6983_rename_workspaces' into develop