Normalize plugin name

[stevegrunwell]

Right now, the plugin is referred to as both "WooCommerce Order Tables" and "WooCommerce Custom Order Tables". This usage should be normalized ahead of an official 1.0.0 release.

[stevegrunwell]

Discussed this with Chris, will normalize on "WooCommerce Custom Orders Table" as the plugin name, and "woocommerce-custom-orders-table" as the slug/text-domain.

Update: "Orders", not "Order"

Update 2: The hyphen will only be used in the plugin header (e.g. "WooCommerce - Custom Orders Table"), as it's a common convention when releasing a plugin that extends another plugin (in this case, WooCommerce)

[stevegrunwell]

Repository has been renamed from https://github.com/liquidweb/woocommerce-order-tables to https://github.com/liquidweb/woocommerce-custom-orders-tables. Per GitHub, redirects have been created automatically.