Adds toggle for primary currency (#5421)

* Add UnitInput component

* Add CurrencyInput component

* Add UserPreferencedCurrencyInput component

* Add UserPreferencedCurrencyDisplay component

* Add updatePreferences action

* Add styles for CurrencyInput, CurrencyDisplay, and UnitInput

* Update SettingsTab page with Primary Currency toggle

* Refactor currency displays and inputs to use UserPreferenced displays and inputs

* Add TokenInput component

* Add UserPreferencedTokenInput component

* Use TokenInput in the send screen

* Fix unit tests

* Fix e2e and integration tests

* Remove send/CurrencyDisplay component

* Replace diamond unicode character with Eth logo. Fix typos

1 files changed, 5 insertions, 0 deletions

diff --git a/ui/app/selectors.js b/ui/app/selectors.js
index fb4517628..9f11551be 100644
--- a/ui/app/selectors.js
+++ b/ui/app/selectors.js
@@ -33,6 +33,7 @@ const selectors = {
   getSendMaxModeState,
   getCurrentViewContext,
   getTotalUnapprovedCount,
+  preferencesSelector,
 }
 
 module.exports = selectors
@@ -195,3 +196,7 @@ function getTotalUnapprovedCount ({ metamask }) {
   return Object.keys(unapprovedTxs).length + unapprovedMsgCount + unapprovedPersonalMsgCount +
     unapprovedTypedMessagesCount
 }
+
+function preferencesSelector ({ metamask }) {
+  return metamask.preferences
+}