static code used during application initialization. This code reads
in various VSE modular properties and adds them to the main BAS properties,
and also takes care of handling the login dialog.
Load any optional manager (VSE) properties/resources.
Then load anything customized by the end customer (Customized.properties,
CustomizedResources.properties).
Once both are loaded, apply any add-on tabs specified by VSE
to the end of the tab list.