Added plus-versions of themes with active color, active & modified color and inactive & modified color

[maxxst]

Because I'm still playing a little bit with the master branch I created a dedicated pull request branch

Like I mentioned in #102 I created plus versions for your themes that have some new behavior:

1. main color indicates active tabs
2. there are secondary and tertiary colors for active & modified and inactive & modified

Here some screenshots to show what I mean:

(assets.json is changed but not saved)

blue+

a    : blue
a + m: purple
i + m: magenta

green+

a    : green
a + m: orange
i + m: magenta

magenta+

a    : magenta
a + m: orange
i + m: blue

orange+

a    : orange
a + m: blue
i + m: magenta

[YabataDesign]

@maxxst, Thank you very much for your contribution.

I need time to carefully review the code and improvements. Now I have a lot of work, so you must be patient.

Thanks so much.

[maxxst]

@YabataDesign no worries :)

I really love your theme and I'm able to use it with my additions already. So no pressure from my side.
If I can do anything to support you just say so :)

[maxxst]

any updates on this ?