Restrict Content Pro 3.5.43

Fix: Error when updating or adding a card with Stripe. Update RCP JS Stripe code since it was using deprecated function.
Improvement: Update styles of registration page. Remove tables, replace with divs. Props James Welbes
Improvement: Update styles of Membership page. Remove table, replace with divs. Align columns. Tweak mobile view. Give inputs a max width. Props James Welbes.

Improvement: Change the label "Membership Level" -> "Membership" in the exporting tools.
Fix: Error when the setting "Remove Data on Uninstall" was enable. There was a wrong file reference.
Update: Misc Setting label "Multiple Free Subscriptions" to "Switch Free Subscription" since it makes more sense.
Add: Missing settings in the System Info Page(Stripe Statement Descriptor, Stripe Statement Suffix, Remove Data on Uninstall, Switch Free Subscription).

Fix: Remove forcing the usage of attributes `userlevel` or `level` in shortcode `[restrict]`. The `[restrict]` shortcode will be deprecated in future releases.