Issue #00005384

New content module "tiles" (Kacheln)

The new container module "tiles" with child modules "tile" produces a column layout using CSS flex-layout.

One advantage over standard columns module (using floated <div>s) is that all tiles have the same height. This makes it possible to "color" a tile or add borders.

The tiles itself are also flex-boxes with vertical direction. This makes it possible to center its content.