Let us do granular style saves

The current styles when applied to a track of subtitles will overwrite text alignment, alignment (zones), fonts, emphasis (bold, italics, underline), and all other styles that might have local exceptions, or already be correctly delivered.

Example would be an DFXP file like this: https://gist.github.com/pkej/27c400eb985cbba9d66138b63359db40

If I create a style where I change the font, the font size and add a semitransparent black background, all the emphasis will be overwritten. If I get a file where the zones are correct (STL only, I think after my testing), and create a style, then it overwrites the zones.

Therefore when importing we need to first:

1. note which words have emphasis
2. note where the text is placed at import
3. Apply style (which overwrite the emphasis, zones and alignment)
4. Then go and change back all the errors introduced with the template style.

The solution would be
Granular control of what attributes/parts of the style gets saved when creating it. When creating is paramount, as we import very often, and it would get tedious to have to select what to apply on every new subtitle file.