Add missing include headers, define Q_NULLPTR for all Qt objects (to
avoid having to include an ugly compat header), use old signal/slot
syntax (Q_SIGNALS are protected in Qt 4.8), disable Qt 5 log message
handler, etc.
Change-Id: I449beb0b74050fdfb0fc5828d8fb74eedb2b45bf
Reviewed-on: https://code.wireshark.org/review/25469
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot
Reviewed-by: Gerald Combs <gerald@wireshark.org>