Add rejuvenate command (#380)

* Add rejuvenate command

Takes one or more entity uids as input. Attempts to find a DamageableComponent on that mob and heal all damage on it.

* Add rejuvenate to right click menu

* Update engine submodule

* Make suggested changes

- Remove redundant error checks in rejuvenate console command, add in relevant ones along with shell messages so the user knows what's going on.
- Remove localization of group check on rejuvenate verb, since the translated version wouldn't be in groups.yml this would've broken the verb in other locales.
- Have the rejuvenate verb attempt to heal the user by default if no arguments were provided to it.

* More localization + help message formatting improvement

* Add more suggested changes

Content.Server/GameObjects/Components/Damage/DamageableComponent.cs

@@ -1,11 +1,17 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Content.Server.Interfaces;
 using Content.Server.Interfaces.GameObjects;
 using Content.Shared.GameObjects;
+using Robust.Server.Interfaces.GameObjects;
 using Robust.Shared.GameObjects;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
 using Robust.Shared.Serialization;
 using Robust.Shared.ViewVariables;
+using Robust.Server.Console;
 
 namespace Content.Server.GameObjects
 {
@@ -105,6 +111,18 @@ namespace Content.Server.GameObjects
             TakeDamage(damageType, -amount);
         }
 
+        public void HealAllDamage()
+        {
+            var values = Enum.GetValues(typeof(DamageType)).Cast<DamageType>();
+            foreach (var damageType in values)
+            {
+                if (CurrentDamage.ContainsKey(damageType) && damageType != DamageType.Total)
+                {
+                    TakeHealing(damageType, CurrentDamage[damageType]);
+                }
+            }
+        }
+
         void UpdateForDamageType(DamageType damageType, int oldValue)
         {
             int change = _currentDamage[damageType] - oldValue;
@@ -169,6 +187,38 @@ namespace Content.Server.GameObjects
                 Thresholds.Add(damageType, new List<DamageThreshold>());
             }
         }
+
+        /// <summary>
+        ///     Completely removes all damage from the DamageableComponent (heals the mob).
+        /// </summary>
+        [Verb]
+        private sealed class RejuvenateVerb : Verb<DamageableComponent>
+        {
+            protected override string GetText(IEntity user, DamageableComponent component) => "Rejuvenate";
+
+            protected override VerbVisibility GetVisibility(IEntity user, DamageableComponent component)
+            {
+                var groupController = IoCManager.Resolve<IConGroupController>();
+
+                if (user.TryGetComponent<IActorComponent>(out var player))
+                {
+                    if (groupController.CanCommand(player.playerSession, "rejuvenate"))
+                        return VerbVisibility.Visible;
+                }
+                return VerbVisibility.Invisible;
+            }
+
+            protected override void Activate(IEntity user, DamageableComponent component)
+            {
+                var groupController = IoCManager.Resolve<IConGroupController>();
+                if (user.TryGetComponent<IActorComponent>(out var player))
+                {
+                    if (groupController.CanCommand(player.playerSession, "rejuvenate"))
+                        component.HealAllDamage();
+                }
+                
+            }
+        }
     }
 }