CocoMUD client

When CocoMUD runs, it assumes its settings and worlds are located at the root. Safe assertion in most cases, but it might be a nice feature to add a support for a command-line argument, allowing to specify the CocoMUD's root. It would allow to run a build version with static configuration, for instance.

Proposed API:

cocomud.exe --root-dir=<other path leading to CocoMUD's configuration>

Most information are not sensitive to the location where they are. The translations, however, should remain the same no matter the specified root directory. This constraint would prevent unpredictable code-breaking on translation changes.