make it easier to create groups

[hofstef]

Is your feature request related to a problem? Please describe.
Groups are the only elements that are placed over other elements. But when the group is dragged onto the canvas, Egon checks if there is another element under the cursor and then prevents the group from being created there.

Groups would also be easier to create if the default size was smaller, since it is easy to make them larger if necessary (but harder to make them smaller, because they automatically resize to fit around their child elements).

Describe the solution you'd like

• Groups should be allowd to be created anywhere on the canvas.
• Make default size smaller

Describe alternatives you've considered
Ideally, groups should work similar to the Lasso tool: By selecting all the elements that should be grouped. The grouping action could be triggered from the multi-element context pad.