Updated MelConditions

@wrye-bash/owners Can someone review this?  It's untested because I don't have any mods that can merge into the Bash Patch with CTDA records.  However, users have reported the error I'm gonna see if I can track one down and see if Arthmoor has a mod or two that he doesn't merge because the old format couldn't handle the third parameter.

I tested this with Fallout New Vegas and some mods that can merge and it seemed to work.  The only difference is `param3` and a few unused bytes.