mumble.pro: when using Qt 5, use its bundled icns plugin instead of our own qicnsicon.
UserListModel: add mumble_pch.hpp header instead of directly using Qt headers in order to fix Qt::escape on Qt 5.
OverlayEditorScene: include QtGlobal before QT_VERSION check in header.
.gitignore: add .qmake.cache, .qmake.stash, and murmurd_plugin_import.cpp.