Minor code optimisations

- 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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