V2.30.1 add feature to same release ver

[rizdaprasetya]

• prevent issue "cannot inherit abstract function" on outdated PHP v5.0.0 - v5.3.8 & v7.0.0 - v7.1.x
• minor description improvement
• add config to allow Customize WooCommerce Order Status upon Payment Paid

[rizdaprasetya]

Also address & closes https://github.com/veritrans/SNAP-Woocommerce/pull/52