Customize unread conversation color

lib/models/config.dart

@@ -23,6 +23,7 @@ class Config {
   final Color primaryColorDark;
   final String appName;
   final String appQuickDescription;
+  final Color unreadConversationColor;
 
   // Entries for the welcome tour
   final TourEntriesBuilder toursEntriesBuilder;
@@ -43,6 +44,7 @@ class Config {
     this.primaryColorDark,
     this.appName = "Comunic",
     this.appQuickDescription,
+    this.unreadConversationColor,
     this.toursEntriesBuilder,
     this.additionalLoading,
     this.mainRouteBuilder,