spads.pl: 0.11.18

. improve vote system: players can now change their votes, and trying to
  call same vote as current vote is now handled as voting yes
. players skill classes are now written in start scripts and thus
  accessible from LUA scripts
. prevent starting a game using "Choose in game" start position type if no
  start box is set (!forceStart is now required in this case)
. use /kickbynum instead of /kick when kicking players from game (/kick is
  dangerous due to substring matching)
. disable workaround for bugged noSpecDraw behavior if Spring version is >
  95 (behavior was reversed previously)
. remove old workaround used for backward compatibility with obsolete
  modules PerlLobbyInterface and PerlAutoHostInterface