Add support for conversation image

lib/ui/tiles/conversation_tile.dart

@@ -1,3 +1,4 @@
+import 'package:cached_network_image/cached_network_image.dart';
 import 'package:comunic/helpers/conversations_helper.dart';
 import 'package:comunic/lists/users_list.dart';
 import 'package:comunic/models/conversation.dart';
@@ -66,13 +67,21 @@ class ConversationTile extends StatelessWidget {
         ),
       ),
 
+      // Tile color
+      tileColor: conversation.sawLastMessage
+          ? null
+          : (conversation.color ?? Colors.blue).withOpacity(0.2),
+
       // Leading icon
-      leading: Icon(
-        conversation.sawLastMessage ? Icons.check_circle : Icons.lens,
-        color: conversation.sawLastMessage
-            ? (darkTheme() ? darkAccentColor : null)
-            : conversation.color ?? Colors.blue,
-      ),
+      leading: conversation.logoURL == null
+          ? Icon(
+              conversation.sawLastMessage ? Icons.check_circle : Icons.lens,
+              color: (darkTheme() ? darkAccentColor : null),
+            )
+          : CachedNetworkImage(
+              imageUrl: conversation.logoURL,
+              width: 30,
+            ),
 
       // Conversation information
       isThreeLine: true,

lib/ui/widgets/custom_list_tile.dart

@@ -17,6 +17,7 @@ class CustomListTile extends StatelessWidget {
   final GestureTapCallback onTap;
   final GestureLongPressCallback onLongPress;
   final bool selected;
+  final Color tileColor;
 
   /// Custom onLongPress function
   final Function(Size, Offset) onLongPressWithInfo;
@@ -39,6 +40,7 @@ class CustomListTile extends StatelessWidget {
     this.selected = false,
     this.onLongPressWithInfo,
     this.onLongPressOpenMenu,
+    this.tileColor,
   })  : assert(isThreeLine != null),
         assert(enabled != null),
         assert(selected != null),
@@ -48,6 +50,7 @@ class CustomListTile extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return ListTile(
+      tileColor: tileColor,
       leading: leading,
       title: title,
       subtitle: subtitle,