Scons check for the QtQuick library.
Forgot to include the qt lib check.

This commit needs to be merged with the last.
Add the fPIC compiler flag needed to compile against qt.

I guess this can be done better by just compiling the wesnoth-qt part
with this flag.
Revert the last commit.
Functions to show qt dialogs.
Ignore rules for Qt Creator IDE.
Added some example and test qt quick qml dialog definitions.
First attempt of replacing the main window.
Create a qt application before QtQuickView can show anything.
Add hotkeys to test qt dialogs.