m_ojoin Remove pointless FindChan() call

Found by Coverity, CID: 1135649
Ignore NULL callbacks in ModuleManager::Reload()

Found by Coverity, CID: 1201453
m_auditorium Handle NULL return from Channel::GetUser() in OnSendWhoLine()

Found by Coverity, CID: 1135647
Allow uppercase letters in IPv6 CIDR masks
m_ssl_openssl Avoid Applink on Windows by calling PEM_read_bio_DHparams() instead of PEM_read_DHparams()
Change Windows libraries to be dynamically linked
Compress the Windows installer with zlib to reduce AV false positives