doc: Add some entries to the changelog
doc: Add some entries to the changelog

These aren't all the user-visible changes, but some "noteworthy" ones.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent