Rework "path" conversions based on the platform

What:

Rework all the "paths" to make sure, everywhere, we use path strings through an instance of "File" instead of a String or check that all the strings used are absolute and OS specific.

Why:

While testing QtTAS 3.0 we ran into a case where evet.getPath() was returning a non OS specific path and that was causing a problem when comparing it with getQtProjectLocation that is OS specific.

Problem before (589793):

• event.getPath():
  • C:/Qt/Examples/Qt-6.8.0/platforms/android/qtquickview/CMakeLists.txt
• getQtProjectLocation():
  • C:\Qt\Examples\Qt-6.8.0\platforms\android\qtquickview