Allow for less than/greater than properties for include/exclude files

[delipunch]

When transcoding a video library with a variety of resolutions, there is no easy way to skip videos that are already have a resolution width/height that is less or greater than x pixels.

For example Exclude files with all of these 2 properties: width: <'720',height: <'480', would skip videos videos smaller than (NTSC) DVD resolution, and can be combined with Copy excluded files to destination: Yes to easily construct a video library for a device that can only handle DVD resolution and below.

If this feature is already in HBBB, please document it better.