Graphical user interface landed

Finally after several years of development a graphical user interface landed. It's far form complete but ready for a first review.

Unlike the other graphical sieve editors, it works like a visual code generator. It just abstracts syntax and basic grammar. Thus grammar is not limited, so it's possible to have arbitrarily nested if statements.

The interface relies on drag&drop. To create Elements just drag them from the sidebar and drop it a the desired position. Deleting is even more simple. Drag the element into the trash, and it's gone including all nested elements. In order to move elements drag them, indicators will guide you where it's safe to drop. To edit an element just click on it.

. They choose to parse and understand scripts.

it does not limit your creativity. Arbitary nested if statements are possible.

It relies and HTML5 and