Module Convenience Macro

Added INSTALL_MODULE macro to mod.hpp which expands to the necessary boilerplate code to support module loading/unloading (i.e. the extern "C" methods Load and Unload).
Configuration Commands

Added /set, which allows options in the settings store to be set/unset either in-game or through the interactive front-end (manually inserting/deleting rows in the database no longer necessary).

Added /get, which allows options in the settings store to be retrieved and displayed either in-game or through the interactive front-end.  May consider adding the ability to enumerate all settings (and therefore list them all alongside their values) at some point in the future.
Maintenance Bugfix

Fixed a race condition and heap use after free (a result of the switch to std::unique_ptr) in the world maintenance routine.
Doxyfile

Doxyfile is no longer being tracked/will now be ignored.