Create a <message> action to show a simple popup message

[end2endzone]

This feature could be useful to show a confirmation message following another action.
For example:

  <message title="Created configuration file '${config_file_path}' without error." icon="information" />

Possible values for icon attribute should match "positive" icons of MessageBox() function:

• information (default)
• exclamation
• none

The 'error' value and error icons shall not be supported since when an executed action returns an error, the following action (in this case a <message>) will not be executed.

The question icon shall not be supported since it is associated with a <prompt> action.

[end2endzone]

The feature is already implemented in <prompt> action with type attribute OK.

[end2endzone]

Reopening the issue. The <message> action is more elaborate than the <prompt> action. It is already clearer to the user.