add customer details and addresses to emails via `woocommerce_email_customer_details` hook
make `woocommerce_email_order_meta_keys` filter args match `woocommerce_email_customer_details_keys`
fix variable naming error
add filter to rename Customer Details section
change array to account for localization per @claudiosmweb
Merge branch 'email_customer_details_hook_backup' into email_customer_details_hook_2

Conflicts:
	includes/class-wc-emails.php
Merge pull request #6735 from helgatheviking/email_customer_details_hook_2

Email customer details hook