Build a simple test project (qmake and CMake) to test the availability of this Qt toolchain

[Fsu0413]

This is needed for (at least) check if the Qt is usable in QtBase.
(Install directory should be renamed for testing relocation)

This should be a continuation of #22 , which is only for Windows.

[Fsu0413]

For static builds of Qt the go-to choice for the test project should be Qt Installer Framework
For dynamic builds of Qt the go-to choice for the test project should be Qt Creator

Pros:

• They need not be implemented by ourselves
• Official use case by tQtC using Qt

Cons:

• Not all modules are used
• Both QtIFW and Qt Creator supports only desktop platform, i.e., Windows and macOS

Qt Installer Framework version support table:

Qt Version	QtIFW Version
5.15	(latest)
6.2	(latest)
6.5	(latest)
6.7	(latest)

Qt Creator version support table:

Qt Version	Qt Creator Version	Notes
5.15	8.0.2 (for CMake) 6.0.2 (for qmake)	Qt Creator 9 dropped building with Qt 5 Qt Creator 7 dropped qmake
6.2	13.0.1	Qt Creator 14 dropped building with Qt 6 before 6.4.3
6.5	(latest)
6.7	(latest)