Exception request: High contrast frames and separators

[Akseli Lahtinen]

Hi!

I have made an accessibility feature that allows to set high-contrast mode for 
any outlines and frames Breeze style has.

Here is the original merge request:
https://invent.kde.org/plasma/breeze/-/merge_requests/393

Do note that it's been split to three separate merge requests!
However, the above linked MR has still all the relevant info.

The string exception request is following:
"Use high contrast frame colors"

This is in Breeze style settings. It can be seen 
in the linked MR in a screenshot.

I do think this would be good to get in ASAP, since it is an accessibility
feature and will be genuinely helpful for many who need high contrast
colors in their setups.

Best regards and happy new year,
Akseli Lahtinen