Modal cart, remove items, checkout
Fix removal and adding of cart items
Improve cart UI
Add cart bundle, remove unused js files from the view when cart isn't used
Do not enable cart by default
Do not put modal into the view when the cart is disabled
Escape js properties
Work with amounts as cents
Make animation speed look constant
Enable tips in the cart
Fix cart UI
* Preserving title with custom amount
* Custom button texts for complete localization
* Update tests, now checking custom amount description and button text
* Support for Custom CSS in POS
* Tweaking appearance of custom amount card
* Allowing POS items to have custom amounts, good for donations/tips
* Prepending currency symbol in POS
* Fixing regression, thanks unit test
