Change CacheRefreshTimer tick time back to 5 minutes
Some systems with whacky va_list implementations do undefined stuff when vsnprintf is called multiple times with the same list, so have InspIRCd::Format va_copy the list before each call
Add a va_copy define for Windows
Remove dead ModeParser code
Cache mode list that is sent in the 004 numeric

Deduplicate UserModeList(), ChannelModeList() and ParaModeList() code
LogManager cleanup