Qt6 Conan.io Poc: Control scripting requirements

Package installation/deploy time control scripting (per package)

1. Create desktop shortcuts (CreateShortcut)
2. Create a .desktop initialization file (CreateDesktopEntry)
3. Install the content into a location, as specified by freedesktop.org (InstallIcons)
4. Register file types, e.g. for QtCreator (RegisterFileType)
5. Save the output from running the executable with the arguments to the installer key, e.g. qmakeOutputInstallerKey by running qmake -query(ConsumeOutput)
6. Move a file from source to target, used e.g. in qt3dstudio , b2qt (Move)
7. distribute value across packages (setValue)
8. set/unset/get environment variables
9. Execute native command line commands, read from stdout/stderr (for example  b2qt pnputil.exe)
10. Query/write Windows registry
11. Show dialog + custom user interfaces (AssociateCommonFiletypesForm, ReadMeCheckBoxForm)
12. Read/write/patch files during installation
    1. write qt.conf
    2. write QtCreator setting files
    3. patch build time paths from files (QtPatch)
13. Undo all above in uninstall