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.

ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -11,9 +11,9 @@
     {
       "identity" : "compound-ios",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/vector-im/compound-ios",
+      "location" : "https://github.com/vector-im/compound-ios.git",
       "state" : {
-        "revision" : "aaa43409ca09130cb9e9a0fe02c803c65aa42aed"
+        "revision" : "d59c317362beba940baa43d6aacdd357e208048d"
       }
     },
     {