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/Other/UserIndicator/UserIndicatorModalView.swift

@@ -36,13 +36,13 @@ struct UserIndicatorModalView: View {
                     }
                     Text(indicator.title)
                         .font(.compound.bodyLG)
-                        .foregroundColor(.element.primaryContent)
+                        .foregroundColor(.compound.textPrimary)
                 }
             }
             .padding()
             .frame(minWidth: 150.0)
             .fixedSize(horizontal: true, vertical: false)
-            .background(Color.element.quinaryContent)
+            .background(Color.compound.bgSubtlePrimary)
             .clipShape(RoundedCornerShape(radius: 12.0, corners: .allCorners))
             .shadow(color: .black.opacity(0.1), radius: 10.0, y: 4.0)
             .onReceive(indicator.progressPublisher) { progress in