Turn `Parse_names` into a vector and add SCP_string overloads of ship registry functions. Refactor calling code to use registry as appropriate. Remove an unused overload of `mission_parse_get_parse_object`.
1) Upgrade the pilot file code to correctly save flags whether entries are added *or* removed
2) Make the tech-db/tech-db-multi ship flag handling consistent
3) Add scripting support for intel entries
4) Add scripting support for adding and removing entries from the tech room
5) Minor cleanup
This maintains the type information which can be used for enforce
const-correctness and also for implementing more advanced ways of
handling the type information.
Goober5000