CB Paid Subscriptions

The current ApplyTo doesn't work. Well it does, but only in 1 hyper specific scenario that is unlikely to be being used. Redesign this to instead allow the Price parameter for options to apply to first, regular, or both using a | delimiter. Examples as follows.

First and regular: 10.0
First only: 10.0|
Regular only: |10.0
Different first and regular: 5.0|10.0

Internally still check for and migrate ApplyTo though so existing usages will still work for backwards compatibility.