Remove structured content persistence handler as it is no longer needed
Remove unnecessary bean declaration
Make BroadleafEnumerations backed by a LinkedHashMap
Add utility method for sorting maps by values
Add several things related to rule builders in the admin:
  - Refactor the blc-rulebuilder-options.js to be generated dynamically
    - This required the addition of the AdminResourceHttpRequestHandler and related classes
  - Refactor StructuredContentImpl to utilize the new annotations for rules
  - Refactor StructuredContentRule to adhere to the new QuantityBasedRule interface