Removing unused entity
Adding new option field_loggeable in order to log changes in a extra field see BT#6174
Minor cosmetic files
Adding table ext_log_entries needed when using the loggeable doctrine extension
Minor - changing function names
Adding *FieldValues classes in order to manage the loggeable option in extra fields see BT#6174
Adding a new parameter in the api_get_utc_datetime function in order to return DateTime objs
Using URLify to clean the field_value field
Loading doctrine extensions at the end