Implementation of additional Qt Quick shape items

PM owner: hakjol

RND owner: frederik

Business justification: Important for the "Designer NG" project

Effort estimate: 

Description:

There is a basic set of visual Qt Quick items (Rectangle, Image, Text, ...). For the implementation of rich user interfaces, a bigger choice of items is needed. Just by offering an additional set of shape items, based on Shape Path, we can offer useful building blocks.

FancyRectangle

This would be a rectangle that supports everything that is possible in CSS and maybe a couple of other features. This means border radius and border can be defined for each corner/edge separately. This is very useful to build custom tab bars and buttons. Additionally, it could support typically button effects like drop shadow or inner glow. See attachment for prototype.

Arc

An arc component is useful for gauges, sliders and radial progress indicators. See attachment for prototype.

Hexagon

Hexagons are used in some IoT UIs. Should be easy to do with shapes.

Circle/Ellipse

Same as arc. Very useful for certain UI elements.

Triangle

Same as a circle.