mumble, murmur: Qt 5 support for Linux.
mumble, murmur: Qt 5 support for Windows.
mumble: fix HWND handling for Qt 5.
mumble: fix Linux build for Qt 4 and Qt 5.
mumble: Qt 5 support for OS X.
mumble: migrate hardcoded 0x050000 Qt version to the QT_VERSION_CHECK macro.
mumble: remove FileEngine.{cpp,h} and use data URLs for better Qt 5 compatibility.
mumble: fix main.cpp to not reference MumbleFileEngineHandler.
mumble: fix dynamic lookup for the 'manual' plugin on OS X with Qt 5.
mumble, plugins: allow 'manual' plugin dialogs to work OS X when using Qt 5.
mumble, plugins: fix QWidget-for-HWND lookup for the 'manual' plugin.
plugins: disable unhinge functionality for the manual plugin when using Qt 5.
plugins/manual: only depend on gui-private on Windows.