Vanilla hub/node feature support.

This pr ads some feature to make overriding some default paths more easy for localhost development where multiple configs are used with one codebase.

- Add Gdn::Config()->DefaultPath() instead of hard-coding PATH_CONF/config.php.
- Fix some false positive csrf requests by not authenticating the transient key on some GET requests.
- Some additional Logger::event() calls.
- A few misc changes that creeped their way into this branch.