Revert back to frontend observer

Revert back to a frontend only observer as admin login has hard coded prototype versions

Admin fix for prototype version

Ref: #56

Invisible ReCaptcha Google Fix

Ref:

#56
#57

Add choice of adaptor - socket/curl

Bump versions

Add choice of adaptor socket/curl

PHP 8.0 fix

Fix as per #52 to silent warning in PHP 8

Subscribe in CMS pages

Refer: #53

Fix checkout not selected

Fix issue where checkout tried to validate when not actually enabled in admin for checkout.

Fix bug introduced with 2.3.7 which broke register at checkout

2.3.8

Fix register no longer validatng

Fix duplicate in checkout

Fix bug as described in #43 by merging guest and register to one if both present for they both get validated as part of Billing Step, so only ONE needs to render

Bump version for composer package

2.3.6

Update composer.json