Relicense approved by relicensecheck except:

- lgplv2+: a.volkov@rusbitech.ru
a.volkov@rusbitech.ru (   1 LOC): d328dd6

Which is a non-copyrightible trivial change.

Now it creates C++ code that uses QString::arg(Args...) instead of
arg().arg().

AFAICS, the type of the "Args" is QString, so this should work.

- This has the same logic as QMap::constFind(); less detaching and now we
can use auto keyword when creating iterators and always get a const_iterator
even when calling constFindEntry() on a non-const map.

- Use QCOMPARE() where appropriate in the unit tests.

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It's a QByteArray not a QString.

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I didn't consider the '#ifdef Q_OS_WIN' code paths (since that compiles
just fine locally).

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- Use a global var for a QString that's used many times
- Break up long-all-cap variable names, it makes it harder to read (and
  I've fixed one typo in one of those ALLCAPS)
- Fix some clazy warnings, make global QString objects in unit tests
static (so that the compiler doesn't create symbols for them, it doesn't
matter in a unit test but KF code acts as a reference sometimes that
others copy from, tip from dfaure)
- Add TODO note about changing kconfig_compiler to generate C++ code that
  uses multi-arg QString::arg(QString, QString, QString) instead of
  QString::arg().arg()
- More const; more QString::at() instead of operator[] where appropriate
- Use a ternary where it makes the code more readable (and uses less lines :))

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