lp1852321 Angular Shelving Location Groups UI Port

lp1852321 Angular Shelving Location Groups UI Port

Port Shelving Location Groups interface from DOJO to Angular. Features
ported include  creating and editing Location Groups, dragging and dropping
Location Groups to change their saved order, adding and removing
Group Entgries, and sorting Shelving Locations in the same order as the old
interface.

Signed-off-by: Mike Risher <mrisher@catalyte.io>
Changes to be committed:
	modified:   Open-ILS/src/eg2/src/app/staff/admin/local/admin-local-splash.component.html
	modified:   Open-ILS/src/eg2/src/app/staff/admin/local/routing.module.ts
	new file:   Open-ILS/src/eg2/src/app/staff/admin/local/shelving_location_groups/shelving_location_groups.component.html
	new file:   Open-ILS/src/eg2/src/app/staff/admin/local/shelving_location_groups/shelving_location_groups.component.ts
	new file:   Open-ILS/src/eg2/src/app/staff/admin/local/shelving_location_groups/shelving_location_groups.module.ts
	new file:   Open-ILS/src/eg2/src/app/staff/admin/local/shelving_location_groups/shelving_location_groups_routing.module.ts