Dungeon Tools

Feature changes:
- Inspiring mobs are now much more noticeable. You should see them with a much more noticeable glow due to a change of texture, scale and alpha
- Now that Nnoggie has announced the reversal of mobDB licensing, it makes sense to clear the namespace clashes. I have moved most of it to `DungeonTools`, while keeping local variables named `MDT` in order to cut down on some of the work. There is still one compatibility issue, but it is on the other side, so there isn't much I can do on that.

Bug fixes:
- Sometimes, if an i18n entry failed to be found, `nil` would be returned. We now default to a proper/sane i18n implementation by overloading the metatable for `MDT.L`, and make it return the key string if the key is not found. As a bonus, keys are no longer globally editable should we ever want to freeze the object.
- On prior versions of MDT, whenever somebody edited the Default route, then reloaded, the default route would get wiped (specifically, `data` would get replaced with `{}`). This was deemed dangerous and no longer in the codebase.

As usual, let me know if you find any issues!