Cool main window for KEXI 3.2
Summary:
Cool main main window as described at https://blogs.kde.org/2016/06/01/kexi-3
- Qt-Creator like global view selector
- better suited for Mac and Windows versions (native menus are back!)
- superflat style with 1990's paddings removed but with with some "material" touch
- content-is-king approach: darker side panes don't stay in the way
- QWidget-based but styled beyond what QWidgets typically can do
- Breeze style and icons-optimized (planned as the default on all OSes for 100% of portability)
- icons styling beyond Breeze: some icons lighten and get colorful on dark backgrounds
- the Kexi/Create/Design button bar will be replaced with something else
Test Plan: Build and try the new GUI
Reviewers: piggz
Subscribers: KEXI
Tags: KEXI
Differential Revision: https://phabricator.kde.org/D11778