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Do you mean "does the website itself come under the licence of the codebase being used"? Not usually, no, although I can think of situations where parts of it might.
Yes, it's defined in the licence(s).
There's also the copyright notices in the source code itself, which you cannot remove.
If you're moving parts of the old codebase to the new, then yes. If you're just reapplying your own game concepts to a new code base, then no.
Copyright doesn't protect ideas.
No, certainly not - but some cases are rather suspicious (eg one day the mud increments its version number and claims to be rewritten entirely from scratch, without any noticable differences from a player perspective).
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