Support icon field of MenuItem
Support icon field of MenuItem

If `MenuItem` structure specifies an icon, let's draw that on the Breadcrumbs.  Applying a class of `ui-menuitem-icon` would allow user to customize display, if desired.
Additional fix is provided for customizing `home.icon` in the case where `home.routerLink` is defined.
It can solve #4891
WebRota/primeng,sourabh8003/ultimate-primeNg,primefaces/primeng,carlosearaujo/primeng,WebRota/primeng,aaraggornn/primeng,WebRota/primeng,311devs/primeng,carlosearaujo/primeng,sourabh8003/ultimate-primeNg,311devs/primeng,aaraggornn/primeng,sourabh8003/ultimate-primeNg,WebRota/primeng,primefaces/primeng,311devs/primeng,carlosearaujo/primeng,primefaces/primeng,311devs/primeng,primefaces/primeng,aaraggornn/primeng,aaraggornn/primeng,sourabh8003/ultimate-primeNg,carlosearaujo/primeng