updates to dropflag RFC
Merge branch 'fsk-nzdrop-rfc' of github.com:pnkfelix/rfcs into fsk-nzdrop-rfc

Conflicts:
	active/0000-remove-drop-flag-and-zeroing.md
Various cleanups to the text presentation.
Address TODOs.

* Added examples for `break` and `return`

* Renamed marker traits and lints to use "early"/"loud" terminology.

* Removed unneeded text that should no longer be necessary now that
  "loud" is the default.