Add a way to automatically use QStringLiteral for every "xxx" style string.

I was trying out Qt5 beta2 these days. One thing troubles me a lot. When I use QJsonObject. I wrote the following:

jsonObject["a"] = "b";

surely it won't work, since QJsonValue requires "b" not to be confused with bool. One way to solve this is:

jsonObject["a"] = QString("b");

And another, which is more recommended (I suppose):

jsonObject["a"] = QStringLiteral("b");

Both of them work well, but require some coding.

While some people may be against using QStringLiteral for every char * style string, I personally want to add QStringLiteral to every one of them after reading the blog related to QStringLiteral.

So what I suggest is maybe adding a switch for compiling or a parameter in .pro file which will generate QStringLiteral for every char * style strings. This can largely simpify my code and do a lot of performance boost.

Thank you for reading...