Please remove static imports from the following classes.
ImageTag (use import com.jpexs.decompiler.flash.SWF instead)
DefineBitsLossless2Tag (write DefineBitsLosslessTag.FORMAT_24BIT_RGB instead)
XFLConverter (write FILLSTYLE.xxx instead)
(Maybe you can remove from NewVersionDialog, too)
They are usually not used, and it is recommended to use it very sparingly.
So I'd like to ask you to remove/replace them, because it would be easier for me to
convert some parts of your code to C# (because C# doesn't support static imports.