Implemented HTTPS checking for web multiplayer, fixed chat jamming all text fields

core/src/io/anuke/mindustry/ui/fragments/ChatFragment.java

@@ -49,7 +49,7 @@ public class ChatFragment extends Table implements Fragment{
 
         //TODO put it in input?
         update(() -> {
-            if(!Net.active()){
+            if(!Net.active() && chatOpen){
                 hide();
             }
 

core/src/io/anuke/mindustry/ui/fragments/MenuFragment.java

@@ -28,7 +28,7 @@ public class MenuFragment implements Fragment{
 					add(new MenuButton("$text.play", group, ui.levels::show));
 					row();
 
-					if(!Vars.gwt) {
+					if(Mindustry.platforms.canJoinGame()) {
 						add(new MenuButton("$text.joingame", group, ui.join::show));
 						row();
 					}