voteSystem implements votes by players on gameplay effects, such as
low gravity, unblockplayers, etc.

Bind the keys in "Voting system (custom)" in order to open the menu,
call a vote, and vote yes or no.

This mod requires an engine that is based on ZDoom revision r4295 or
higher, such as Zandronum, because the ACS source code assumes that
the returned string from StrParam is available indefinitely.
