Maybe not what you asked for, and it doesn't include version numbers, but maybe <wowdir>\WTF\Account\<accountname>\AddOns.txt
will do anyways?
However it doesn't seem to remove addons if you remove them from your addons folder, so to get a current list just remove it, load the game, disable those addons you wish and exit.
Versions are quite hard to get in any case since there is none required or commonly used in any of the addon-files, although most (or maybe all?) ACE addons have it.