Use "When an order is first paid in full" event instead of "After updating an existing commerce order" for updating total contributed amount of a product

- updated "Contribution display" display settings of "Contribution product" field to disable combining like items
- removed rule "Merge line item quantities"

Fixed "Sum duplicate contribution product amounts" rule component, improved admin Contributions view

- Disallow too big contributions
- Merge line item quantities
Added rule components:
- Compare total contribution with target amount
Updated rules:
- Merge duplicate contribution products