Multi-tier paywall - images and colors by tier

Template 5 but with multiple tiers 😊

Enabling Template 7 by changing 7_disabled to 7

Changed a header.jpg to header.heic to try and fix issue with weirdly failing snapshot UI test
Changed visibility on TestData from public to internal
Hides tier selector if only one tier
Changed color_overrides_by_tier to colors_by_tier and image_overrides_by_tier to images_by_tier
- The original implementation was going to default to existing color and images configurations and then override by tier
- However, this turned out to be harder to implement on the configuration side
Colors got four new optional values
- tier_control_background
- tier_control_foreground
- tier_control_selected_background
- tier_control_selected_foreground

	2 Warnings
:warning:	Size check is being bypassed due to the presence of the label "danger-bypass-size-limit"
:warning:	Size increase: 599.14 KB

RevenueCat / purchases-ios