Move the window through the title bar element itself

The compositor is redundant in the process of moving the window.
Have the title bar react to move all by itself.

Additionally, a clearer structure in the window was introduced.
The non-client area has been extracted into a separate class, as
was the icon store and free DOM functions used across files.

Since it was now easy, made the window maximize/restore on double click
on the title element.

Fixes: QTBUG-107626
Pick-to: 6.5
Change-Id: Iba7f207e46806ae7162656965892ae5a48ac5ebe
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

0 files changed, 0 insertions, 0 deletions