Made setting the game speed a game action (#20825)

* Bare minimum for a game action

* Changelog entry

* Fixed formatting

* Consistent capitalization

* Committed wrong file

* Removing redundant toolbar invalidations

* Bump network version; remove redundant qualifier

* Fixed crash on starting server

src/openrct2/scripting/ScriptEngine.cpp

@@ -1326,6 +1326,7 @@ const static EnumMap<GameCommand> ActionNameToType = {
     { "footpathremove", GameCommand::RemovePath },
     { "footpathadditionplace", GameCommand::PlaceFootpathAddition },
     { "footpathadditionremove", GameCommand::RemoveFootpathAddition },
+    { "gamesetspeed", GameCommand::SetGameSpeed },
     { "guestsetflags", GameCommand::GuestSetFlags },
     { "guestsetname", GameCommand::SetGuestName },
     { "landbuyrights", GameCommand::BuyLandRights },