Implement a new type of separator for creating a menu with multiple columns.

[end2endzone]

Windows support multiple type of separator, one of them is a column separator which forces a menu item to be displayed on a new column.

The flags MENUBARBREAK or MENUBREAK can be used to create column menu.

See https://docs.microsoft.com/en-us/windows/win32/menurc/menuitem-statement for details.

The suggested implementation in a configuration file may look something like this:

<menu separator="true" type="column" />

By default, the value of the type attribute should be horizontal, therefore, the following would created a legacy separator:

<menu separator="true" type="horizontal" />

[end2endzone]

Documentation for popup menus: https://docs.microsoft.com/en-us/windows/win32/menurc/popup-resource

[end2endzone]

Here is a code example that show how to create a second column in a popup menu: demo_popup_menu.zip. It seems that the new column flag must be added to a valid (clickable) element as opposed to a normal separator.

[end2endzone]

Using type attribute for a separator might not be the best idea. A type attribute should be more suited for a different type of menu.

Another implementation could be to expand the separator attribute to allow values such as horizontal, column and vertical. For example:

<menu separator="true" />
<menu separator="horizontal" />
<menu separator="column" />
<menu separator="vertical" />
```