Enqueue scripts if WooCommerce is installed

[crftwrk]

• Closes Merge both headers into one and enable Woo parts if WooCommerce is activated #460
• Related PR https://github.com/bootscore/bootscore-child/pull/27/files

This PR enables Woo scripts if plugin is installed and has no breaking changes for existing bootcommerce-child installations.

• woocommerce-functions.php content has been moved to wc-functions.php
• woocommerce-functions.php still exists because existing bootcommerce-child installations have require get_template_directory() . '/woocommerce/woocommerce-functions.php'; in their functions.php
• Styles for WooCommerce gets compiled by default. Had a look to it, this are round about 700 beautified lines of compiled CSS. There is a comment that @import line can be deleted if Woo styles are not needed. Related PR for bootscore-child theme https://github.com/bootscore/bootscore-child/pull/27/files
• When merged, we can archive or close the bootcommerce-child repo, because main-theme and bootscore-child are now be able to manage a shop. One repo less.

Tested it on some live shops and works fine.

@justinkruit if you like it, merge it.

[justinkruit]

This all looks great to me, and a next step to make updates easier. 👍