improved (most) icons/image scaling, including avatar scaling

lib/pages/chat/chat_view.dart

@@ -212,6 +212,7 @@ class ChatView extends StatelessWidget {
                           width: double.infinity,
                           height: double.infinity,
                           fit: BoxFit.cover,
+                          filterQuality: FilterQuality.medium,
                         ),
                       SafeArea(
                         child: Column(

lib/pages/chat/typing_indicators.dart

@@ -84,7 +84,7 @@ class TypingIndicators extends StatelessWidget {
                   padding: const EdgeInsets.all(8),
                   child: typingUsers.isEmpty
                       ? null
-                      : Image.asset('assets/typing.gif', height: 12),
+                      : Image.asset('assets/typing.gif', height: 30, filterQuality: FilterQuality.medium,),
                 ),
               ),
             ),

lib/pages/homeserver_picker/homeserver_picker_view.dart

@@ -46,8 +46,8 @@ class HomeserverPickerView extends StatelessWidget {
               children: [
                 Container(
                   alignment: Alignment.center,
-                  height: 190,
-                  child: Image.asset('assets/info-logo.png'),
+                  height: 200,
+                  child: Image.asset('assets/info-logo.png', filterQuality: FilterQuality.medium,),
                 ),
                 Padding(
                   padding: const EdgeInsets.all(12.0),