lp1857911 Statistical Categories UI port

lp1857911 Statistical Categories UI port
This UI allows editing copy statistical categories (stat cats), patron
statistical categories, and their entries. They are filtered by location
and permissions are needed. A separate page is used when editing,
deleting or adding entries.

Signed-off-by: Mike Risher <mrisher@catalyte.io>
 Changes to be committed:
modified:   Open-ILS/examples/fm_IDL.xml
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/stat_cat/stat_cat.component.html
new file:   Open-ILS/src/eg2/src/app/staff/admin/local/stat_cat/stat_cat.component.ts
new file:   Open-ILS/src/eg2/src/app/staff/admin/local/stat_cat/stat_cat.module.ts
new file:   Open-ILS/src/eg2/src/app/staff/admin/local/stat_cat/stat_cat_entries.component.html
new file:   Open-ILS/src/eg2/src/app/staff/admin/local/stat_cat/stat_cat_entries.component.ts
new file:   Open-ILS/src/eg2/src/app/staff/admin/local/stat_cat/stat_cat_routing.module.ts

Signed-off-by: Mike Risher <mrisher@catalyte.io>