eo base - optimize memory by extending extension memory

eo base - optimize memory by extending extension memory

so geneirc data, wrefs, comments and id's are not that common so put
them all into their own memory segment that's allocated separately to
the core object so we only use this memory when needed. we already had
an extension section anyway so it's not new - just using it now for
more of the rarer bits of data. 2 more pointers gone from most objects
anyway and now extension code handling is a bit cleaner.