Easy Digital Downloads - Message 1.2.4

Improvement: Improved customer/vendor details header styling to match EDD 3.0.
Fix: A fatal error could happen on the vendor details messages tab in EDD 3.0.

Change: Emails to FES vendors are now logged with the vendor ID when logging is enabled.
Fix: Emails to FES vendors could have been linked to a customer.
Fix: When an email address was selected, the contact name was not visible in the "to" field.
Dev: Update how licensing is instantiated.
Dev: Refactor how the plugin is booted and checks for requirements.
Dev: Improved compatibility with PHP 8.1.

Improvement: Message form now resets after sending and a success notice is shown.
Fix: Purchase receipts not being logged if email subject is empty.
Tweak: Update plugin author name and URI.
Dev: EDD 3.0 compatibility.