Adopt Compound Colours (#1086)

* Delete deprecated font tokens.

* Migrate from primaryContent to textPrimary/iconPrimary.

* Migrate from links to textLinkExternal.

* Migrate from secondaryContent to textSecondary/iconSecondary.

* Migrate from accent to textActionPrimary.

- Some uses changed to textPrimary or iconPrimary as necessary.
- Some manual tints removed now that that Sentry is fixed.

* Migrate alert to textCriticalPrimary/iconCriticalPrimary.

* Migrate from brand to textActionAccent/iconAccentTertiary.

* Migrate from background to bgCanvasDefault or text/iconOnSolidPrimary

* Migrate system to bgSubtleSecondary.

* Remove ElementUIColors and obsolete migrated colours.

* Migrate tertiaryContent/quaternaryContent/quinaryContent to Compound.

* Migrate bubblesYou/bubblesNotYou to use Compound.

* Update Compound.

project.yml

@@ -53,7 +53,7 @@ packages:
     minorVersion: 5.13.0
   Compound:
     url: https://github.com/vector-im/compound-ios
-    revision: aaa43409ca09130cb9e9a0fe02c803c65aa42aed
+    revision: d59c317362beba940baa43d6aacdd357e208048d
     # path: ../compound-ios
   Algorithms:
     url: https://github.com/apple/swift-algorithms