add TPS HUD module

Shows the server's tps from ServerManager, which already measures it
from the vanilla time-sync packet (20 ticks per packet).

src/main/java/cc/fros/features/modules/hud/TpsHudModule.java

@@ -0,0 +1,27 @@
+package cc.fros.features.modules.hud;
+
+import cc.fros.Fros;
+import cc.fros.event.impl.render.Render2DEvent;
+import cc.fros.features.modules.client.HudModule;
+import cc.fros.util.render.FrosFont;
+
+import java.util.Locale;
+
+public class TpsHudModule extends HudModule {
+
+    public TpsHudModule() {
+        super("TPS", "Display the server's tps", 100, 10);
+    }
+
+    @Override
+    protected void render(Render2DEvent e) {
+        super.render(e);
+
+        String tpsStr = String.format(Locale.ROOT, "TPS: %.1f", Fros.serverManager.getTps());
+
+        FrosFont.draw(e.getContext(), tpsStr, (int) getX(), (int) getY(), -1);
+
+        setWidth(FrosFont.width(tpsStr));
+        setHeight(FrosFont.lineHeight());
+    }
+}

src/main/java/cc/fros/manager/ModuleManager.java

@@ -19,6 +19,7 @@ import cc.fros.features.modules.combat.CriticalsModule;
 import cc.fros.features.modules.combat.KeyPearlModule;
 import cc.fros.features.modules.hud.ArrayListHudModule;
 import cc.fros.features.modules.hud.ArmorHudModule;
+import cc.fros.features.modules.hud.TpsHudModule;
 import cc.fros.features.modules.hud.CoordinatesHudModule;
 import cc.fros.features.modules.hud.FpsHudModule;
 import cc.fros.features.modules.hud.PingHudModule;
@@ -59,6 +60,7 @@ public class ModuleManager implements Jsonable, Util {
         register(new WelcomerHudModule());
         register(new TimeHudModule());
         register(new ArmorHudModule());
+        register(new TpsHudModule());
         register(new HudEditorModule());
         register(new ClickGuiModule());
         register(new NotificationsModule());