Remove Solidus 2.x deprecations

[kennyadsl]

• Add a method in solidus_support that understands if name should be used combined or not taking into account the Solidus version used and the related preference's value Add a method to check if combined address name is being used  solidus_support#58
• Release a new version of Solidus Support
• Remove deprecation warnings related to the address' name combined.
• DEPRECATION WARNING: From Solidus v3.0 onwards, #perform! will need to be explicitly called when creating new refunds. Please, change your code from: Spree::Refund.create(your: attributes) to: Spree::Refund.create(your: attributes, perform_after_create: false).perform! (called from try_void at ~/Code/solidusio/solidus_stripe/app/models/spree/payment_method/stripe_credit_card.rb:90)
• DEPRECATION WARNING: Please, do not use Spree::Refund @response anymore, use Spree::Refund#perform_response Args: [] (called from record_response at ~/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/solidus-ed88ebc464d1/core/app/models/spree/payment/processing.rb:206)
• DEPRECATION WARNING: Please, do not use Spree::Refund @response anymore, use Spree::Refund#perform_response Args: [] (called from handle_void_response at /~/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/solidus-ed88ebc464d1/core/app/models/spree/payment/processing.rb:132)

cc @rainerdema