Generic and flexible way to patch needed files during installation

We need more flexible way to patch needed files during installation. Also the current way to defining files-to-patch-* resource and triggering the IFW operation via installscript.qs is sub-optimal.

Also packaging needs to get rid of pre-patching artifacts meaning these patching steps should be executed during installation where we already patch files too.

It should be possible to define patching rules e.g. in .json/.yaml format which are then interpreted by the patcher.

• write to files
• replace strings from files (include filters apply), regex support needed
• installation paths of the artifacts should be possible to be defined
  • possibility to strip out directory levels from artifacts

The patcher should be a generic component which can be built as part of the installer or built as a stand alone command line application. To have it as stand alone application helps greatly to track down possible patching related issues and enables testing the logic better as well.

As a separate component the patcher can also be used in upcoming Qt6 installers.

Proposal:

• To reduce the use of script engine, installer should support defining most common cases in package.xml. For example:
  • <Operations>
  •     <QtPatch>...</>
  •     <Shortcuts>...</>
  •     <Setting>...</>
  • </>