major, kick old message command syntax

From now on only HTTP will be supported.

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, follow-up, also don't check for yacc and lex anymore

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'feat/http' into next

* feat/http:
  chore, follow-up, also don't check for yacc and lex anymore
  major, kick old message command syntax