Removed Leaflet Package

Removed Leaflet Package
Organizing and Optimizing

- Moved Esri Enums to their own JSON file.
- Moved sample servers to their own JSON. Switching loading the list
from HTML to the JSON file.
Icons

- Changed icons.
- Added larger icons.
- Added missing service icons.
- Added template for Geometry Server, Geocode Server, and NAServer.
- Added new partial for Service Header with no map.
Fixed mapExtent

- Fixed display of extents on a map in the mapExtent page.
- This works for most, but not all, extents. Some extents fail because
of failure to project basemap.