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, 10 insertions, 0 deletions

diff --git a/ui/app/components/currency-display/index.scss b/ui/app/components/currency-display/index.scss
new file mode 100644
index 000000000..8c0196102
--- /dev/null
+++ b/ui/app/components/currency-display/index.scss
@@ -0,0 +1,10 @@
+.currency-display-component {
+  display: flex;
+  align-items: center;
+
+  &__text {
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+  }
+}