[ChangeLog][QtQml][Important Behavior Changes] Using the Qt Quick Compiler would exclude the original .qml files from the resource system. This made it impossible to change the Qt library binary later as the program binary was tied the to the exact Qt version. In addition sometimes unrelated files (QTBUG-73669) were removed. For the latter scenario, retain and skip options were added for the Qt Quick Compiler. In Qt 5.15 the Qt Quick Compiler does not remove the input files anymore. All files are retained and the compiler merely adds the more efficient binary representation to the application. Task-number: QTBUG-73669 Change-Id: I5a523bfc69d4f48a1451bd880616c82fd73b8d15 Reviewed-by: Ulf Hermann <ulf.hermann@qt.io> Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>