QThreadStorage

This was done in https://github.com/fluxer/katie/commit/adfc21fc0f323539fe8db0716e09df2ed12b3b8a, alternative to it is static thread_local member.

No source compatible methods are in place because you should evaluate how to handle this in your projects. For an example:

class MyClass {
    QThreadStorage<int> mymember;
};

Should be changed to:

class MyClass {
    static thread_local int mymember;
};
thread_local int MyClass::mymember = 0;