the stop dump zone command was implemented as a courtesy to other
players in order to take into account when they would stop looking at
unknown information
however, this can be abused, a malicious client can send this command
whenever they would like
cockatrice is not a physical tabletop nor does it aim to be, if you can
take a screenshot of your deck and then close the view, you are not
cheating as you have been given this information
in order to prevent anyone from abusing this we should remove the
command from the protocol, this means servers will ignore this message
and clients will get a little invalid command reply in their debug log
the extension id will remain reserved
shuffling your deck will always invalidate any card view looking at
those cards
if players wish to signal that they stopped looking at their deck for
whatever reason they should just use the chat instead, optionally using
one of the chat macros
That marker is only recognized by pb3-compatible compilers, meaning that
tools which are otherwise compatible with our files break on them.
Notably, this includes hprotoc (for haskell).
