MiniClient is missing rendering operations for rounded rectangles

[stuckless]

Currently Rounded Rectangles and Filled Rounded Rectangles just render as square rectangles.

This article contains some information on creating filled rounded rectangles.
https://developerover30.wordpress.com/2014/11/11/libgdx-creating-a-rounded-rectangle-pixmap/

Also check out drawOval() and fillOval() since they appear to use a circle, but should actually be using an oval. ShapeRenderer has ellipse() method for drawing ovals.

https://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/glutils/ShapeRenderer.html