Update Product APIs to V10

See merge request !117

Update ITEM_CREATE/ITEM_UPDATE to V9

See merge request !116

Update price api for multi-store pricing

See merge request !115

Updating files with v8

See merge request !114

ECOM-1502: Item Create and Update v8

See merge request !113

Updated the item create and update services with the v8 WSDL.  This adds an "Attribute Set"

Other improvements:

* Updated composer.lock file (it was out of sync) and added required PHP modules
* Removed references to deleted UnsupportedCurrencyException class
* Added strict type checking in strcascomp() output

Update OrderInterfacingService so an optional orig sys doc ref can be specified.

See merge request !112

Fix relative link

See merge request !111

Add Customer Lookup Service.

See merge request !110

Add CBS payment lookup service.

See merge request !109

Adding Pickup addresses, and received shipping methods.

See merge request !108

Always return a default for `Product` getters

See merge request !107

Remove MoneyPHP, use `float`s instead

See merge request !106

Add CBS constant for Drop Shipping

See merge request !105

Don't check types at all

See merge request !104