12-column based layout

[entrhopi]

I'd like to add a 12-column based layout option (similar to some HTML layouts) to all controls to ease the layout work for module developers. If this becomes widely adopted it could also help streamline the 'visual lines' between all the modules.

Any suggestions are much appreciated!

Usage:

new Panel() {
    ColumnWidth = 4,
    Parent = parentPanel,
};

Effectively Size and Location should be dynamically calculated based on the parent container and all siblings.