Lionel Chauvin authored Mar 24, 2019 and Nate Graham committed Mar 24, 2019

Summary:
This patch increases Yakuake customization possibilities without break existing skins.
The new features are:
- new tab button can be positionned at the end of tabs
- selected tab text can be not bold
- titlebar's title can be centered
- titlebar's icons can be anchored at left
- a compact mode that superposes title and tabbar

Here examples of what can be achieved with these changes:

{F6698444}

{F6711610}

Test Plan:
Install skins:

{F6711608}
{F6711609}

Reviewers: hein, #yakuake

Reviewed By: hein

Tags: #yakuake

Differential Revision: https://phabricator.kde.org/D19835