fuseMatSidenav
is a helper directive that enhances the Angular Material's sidenav. It modifies
the sidenav so it will function like the Angular Material 1.x sidenav. It also has a service which you can
register a sidenav in order to access and control its status from anywhere.
fuseMatSidenavHelper
A unique name for the sidenav.
mat-is-locked-open
Adds a locked open functionality just like Angular Material 1.x sidenav. Works with the media step
aliases of the FlexLayout library.