Adding image import Widget. Updating Plugin CMake files to remove a generated file that is both empty and not needed anymore. Moved the generation of files based on prefix, suffix, start index, end index and extension to its own class consisting of a single static method that generates the file list. This can be reused by a few classes that have to generate a list of files. Adding missing Q_PROPERTY to some filter headers.
Adding missing VS cdecls macro in the class declaration.
Fixing missing Q_PROPERTY definitions for each of the classes.