Expanded BXGamebox API to expose the mutability of the gamebox and the concept of the gamebox being locked. Reworked BXGamebox's documentation API. BXSession will now attempt to create and autopopulate the gamebox's documentation folder the first time the documentation browser is opened, to permit immediate modification and addition of new documentation.
Reworked gamebox 'locked' check to use only the results of an is-writable check and to cache the results for several seconds. Fixed numerous stupid bugs in documentation browser modifiability checks. Fixed incorrect sizing of documentation browser items when only one item is in the browser and another one is added.