Some servers may send a colon even if the last parameter doesn't need it, currently this leads to issues with permission/mode tracking, as the core doesn't handle the colon properly.
This fix replaces reconstructing the parameter string with just passing a vector of the relevant parameters to CChan::SetModes() and adds overrides for CChan::SetModes() and CChan::ModeChange() that accept the vector instead.
Clean up uses of old CModeMessage::GetModes()
95369455fc