WC 4.4.1 Compatibility Bump

[chickenn00dle]

This PR bumps the WC tested up to header to 4.4.1.

This also does the following:

• replaces the use of the deprecated WC_Subscription::update_manual with WC_Subscription::set_requires_manual_renewal.
• Replaces direct access of subs ID with call to get_id()

I tested this with the latest versions of WC, WC Subs, and WC Memberships.

Closes #223

[wigglemuff]

@chickenn00dle This LGTM. However, the Travis CI build fails.

$ bash tests/bin/install.sh wcsie_test root '' localhost $WP_VERSION

0.70s$ bash tests/bin/travis.sh before

WooCommerce Installed

Cloning into '../woocommerce-subscriptions'...

remote: Repository not found.

fatal: repository 'https://[secure]@github.com/Prospress/woocommerce-subscriptions.git/' not found

The command "bash tests/bin/travis.sh before" failed and exited with 128 during .

I think we'll need to fix the subscriptions repo URL here: https://github.com/woocommerce/woocommerce-subscriptions-importer-exporter/blob/master/tests/bin/travis.sh. I'll do it and see if that helps.

[LukeAbell]

@codestor4 @chickenn00dle can you get this merged?

[wigglemuff]

I did a rebase of this with master with the hope that these changes would help fix the Travis build issue.

Travis build still fails but for other reasons (PHPCS issues).

We can fix PHPCS issues in a separate PR. I'll go ahead and merge this now!

[LukeAbell]

Thank you!!