[pmpro_membership_level] shortcode

[kimcoleman]

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Changes proposed in this Pull Request:

Creates a new pmpro_membership_level shortcode to display individual parts of a Membership Level (for Page Builders and custom-crafting a Membership Levels / Pricing page.

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Changelog entry

• FEATURE: Added new pmpro_membership_level shortcode to pull in dynamic information about a specific level ID.

Enter a summary of all changes on this Pull Request. This will appear in the changelog if accepted.

[dparker1005]

Looks good! A couple thoughts:

• Do we need to strip this shortcode from posts if the editor doesn't have the edit_users capability? With user meta, there could be sensitive data there that we don't want to get out. But are these level settings sensitive?

• In other places in the code, we override the "confirmation" message to be an empty string if the current user doesn't have the corresponding membership level. We should consider doing that here as well