Full QML compatibility

[jpnurmi]

IrcCore:

• IrcConnection::password() [signal] (-> property)
• IrcConnection::capabilities() [signal] (send a command / IrcNetwork::requestCapability())
• IrcConnection::nickNameReserved() [signal] (just set the desired nick)
• IrcConnection::createCtcpReply() [virtual] (can be "reimplemented" in QML)
• IrcMessageFilter
• IrcSender (-> IrcMessage::prefix/nick/ident/host)
• IrcSessionInfo (-> IrcNetwork)
• IrcNetwork::channelModes()
• IrcNetwork::numericLimit()
• IrcNetwork::modeLimit()
• IrcNetwork::channelLimit()
• IrcNetwork::targetLimit()
• Irc::toString() (-> Irc::codeToString())

IrcModel:

• IrcBufferModel::create() [virtual] (can be "reimplemented" in QML)
• IrcBufferModel::destroy() [virtual] (-> IrcBuffer::persistent [property])

IrcUtil:

• IrcCommandParser
• IrcTextFormat
• IrcPalette(-> merged to IrcTextFormat)

[jpnurmi]

Everything else on the list done except IrcMessageFilter, which is left to C++ only... it's a bit advanced concept anyway.