usort() deprecation on admin overview and PHP notice when creating a new snippet

@Strakkie Thanks for the patch!

The warning fix is definitely needed. However, the other part breaks the module. The way this module works is that you create items, and then you add content to them. That's the content. Note the function "content_snippets_config()".

Items include a name, a machine name, a type, and a description for your snippet. Those appear under the "Content -> Snippets" for site editors with the proper permissions to set values for those. So, you need to create the item and THEN set the value for it as separate tasks. The idea is that the sitebuilder or developer creates the items, and leaves it to the content editor to be able to change the text. This help make site content editable rather than hard-coded for custom usages.

Automatically closed - issue fixed for 2 weeks with no activity.