Removes "res:/UI/Texture/Icons/....png" from iconFile

Partial fix to #80.

This simply removes `res:/UI/Texture/Icons/ ... .png` from the icon file value, which allows us to store only the needed info. only problem is instead of "02_02" format, it will be stored as "02_SIZE_02" format. This is not a big deal as we can name the file whatever we want regardless of size. I could have used a bit of regex or splitting to remove the size, but there are also other icons that don't follow the `##_##_##` format and I didn't think it was needed. It only break consistency in the icon names.