Allow deleting all existing snippets within a group

[carloscadux]

Is your feature request related to a problem? Please describe. Currently the context menu of a snippet group provides the command 'delete', but when triggered, there is the message:

You can't delete a snippet group!

Describe the solution you'd like Although the deletion of a group itself (root) seems to not be allowed by design, the command could delete all snippets within that group (with a warning message preferably). Maybe the command on the context menu (when clicking a group) could be named "delete all snippets in the group"

[devon2018]

Thanks for the comment, will consider this for the next update.