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/Sources/Screens/RoomScreen/View/TimelineItemMenu.swift

@@ -86,9 +86,9 @@ public struct TimelineItemMenu: View {
                 }
             }
         }
+        .background(Color.compound.bgCanvasDefault.ignoresSafeArea())
         .presentationDetents([.medium, .large])
         .presentationDragIndicator(.visible)
-        .tint(.element.accent)
     }
     
     private var header: some View {
@@ -164,7 +164,7 @@ public struct TimelineItemMenu: View {
     
     private func reactionBackgroundColor(for emoji: String) -> Color {
         if item.properties.reactions.first(where: { $0.key == emoji }) != nil {
-            return .element.quinaryContent
+            return .compound._bgReactionButton
         } else {
             return .clear
         }