Added /revive command

Now it's more convenient to revive character without food :>

src/main/java/emu/grasscutter/command/commands/Revive.java

+package emu.grasscutter.command.commands;
+
+import emu.grasscutter.command.Command;
+import emu.grasscutter.command.CommandHandler;
+import emu.grasscutter.game.GenshinPlayer;
+import emu.grasscutter.game.TeamManager;
+//import emu.grasscutter.game.avatar.GenshinAvatar;
+//import emu.grasscutter.game.TeamInfo;
+import emu.grasscutter.game.entity.EntityAvatar;
+import emu.grasscutter.game.props.FightProperty;
+import emu.grasscutter.server.packet.send.PacketAvatarFightPropUpdateNotify;
+import emu.grasscutter.server.packet.send.PacketAvatarLifeStateChangeNotify;
+
+import java.util.List;
+
+@Command(label = "revive", aliases = {"rev"},
+            usage = "revive|rev", description = "Revive character(s) that died)")
+public class Revive implements CommandHandler {       
+    //private Object teamId;
+
+    @Override
+    public void execute(GenshinPlayer player, List<String> args) {       
+        for (EntityAvatar entity2 : TeamManager.getActiveTeam()) {
+			entity2.setFightProperty(
+					FightProperty.FIGHT_PROP_CUR_HP, 
+					entity2.getFightProperty(FightProperty.FIGHT_PROP_MAX_HP) * .4f
+			);
+			player.sendPacket(new PacketAvatarFightPropUpdateNotify(entity2.getAvatar(), FightProperty.FIGHT_PROP_CUR_HP));
+			player.sendPacket(new PacketAvatarLifeStateChangeNotify(entity2.getAvatar()));
+		}
+        player.dropMessage("Character revived.");
+    }
+}