Update to Qt Creator 4

[dmik]

This is what Qt 5 needs.

In response to #9.

[martinrotter]

I mean, we do not need plugins, we do not need designer. We simply need Qt Creator to load qmake-based qt5 projects and debug them with gdb. That would help me hugely to optimize and fix my application RSS Guard which has some os2-specific quirks.

Some of those problem I already identified like that copy/paste in qt apps on os2 does not seem to generally work (?) and that QTcpServer is sometimes not stopped when QTcpServer::close() is called.

[dmik]

It doesn't really matter with or without plugins, there isn't that much of platform dependent code (and that which is there is located in the core of Qt Creator). I see what you need but we don't have a working GDB port ATM and for this reason debugging has never worked in Qt Creator for OS/2. I can only suggest you to use plain old logging to a file for debugging at this time.

The copy/paste functionality is simply not implemented ATM (but it will be addressed soon, bitwiseworks/qtbase-os2#123).