Fall Festival Gem Promo (#138)

* content: add gems blocks

* gemsBlocks: include ios and android identifiers

* wip: promo code

* split common constants into multiple files

* add second promo part

* geCurrentEvent, refactor promo

* fix lint

* fix exports, use world state api

* start adding world state tests

* remove console.log

* use gems block for purchases

* remove comments

* fix most unit tests

* restore comment

* fix lint

* prevent apple/google gift tests from breaking other tests when stub is not reset

* fix unit tests, clarify tests names

* iap: use gift object when gifting gems

* allow gift object with less data

* fix iap tests, remove findById stubs

* iap: require less data from the mobile apps

* apply discounts

* add missing worldState file

* fix lint

* add test event

* start removing 20 gems option for web

* start adding support for all gems packages on web

* fix unit tests for apple, stripe and google

* amazon: support all gems blocks

* paypal: support all gems blocks

* fix payments unit tests, add tests for getGemsBlock

* web: add gems plans with discounts, update stripe

* fix amazon and paypal clients, payments success modals

* amazon pay: disabled state

* update icons, start abstracting payments buttons

* begin redesign

* redesign gems modal

* fix buttons

* fix hover color for gems modal close icon

* add key to world state current event

* extend test event length

* implement gems modals designs

* early test fall2020

* fix header banner position

* add missing files

* use iso 8601 for dates, minor ui fixes

* fix time zones

* events: fix ISO8601 format

* fix css indentation

* start abstracting banners

* refactor payments buttons

* test spooky, fix group plans box

* implement gems promo banners, refactor banners, fixes

* fix lint

* fix dates

* remove unused i18n strings

* fix stripe integration test

* fix world state integration tests

* the current active event

* add missing unit tests

* add storybook story for payments buttons component

* fix typo

* fix(stripe): correct label when gifting subscriptions

website/common/script/errors/apiErrorMessages.js

@@ -25,6 +25,7 @@ export default {
   missingCustomerId: 'Missing "req.query.customerId"',
   missingPaypalBlock: 'Missing "req.session.paypalBlock"',
   missingSubKey: 'Missing "req.query.sub"',
+  invalidGemsBlock: 'The supplied gemsBlock does not exists',
 
   ipAddressBlocked: 'Your access to Habitica has been blocked. This may be due to a breach of our Terms of Service or for other reasons. For details or to ask to be unblocked, please email admin@habitica.com or ask your parent or guardian to email them. Include your Habitica @Username or User Id in the email if you know it.',
   clientRateLimited: 'This User ID or IP address has been rate limited due to an excess amount of requests to the Habitica API v3. More info can be found in the response headers and at https://habitica.fandom.com/wiki/Guidance_for_Comrades#Rules_for_Third-Party_Tools under the section Rate Limiting.',