Switch from drainallbatteries to a drain/fill-specific-battery command for saner eventing (#5077)

* drain all batteries / drain battery command for saner eventing

* Reverts the part of the previous commit where drainallbatteries skips items, despite my better judgement

* setbatterypercent now takes the place of battery drainage commands

A more forall-oriented approach

Content.Server/Power/SetBatteryPercentCommand.cs

@@ -0,0 +1,49 @@
+using Content.Server.Administration;
+using Content.Server.Power.Components;
+using Content.Server.Items;
+using Content.Shared.Administration;
+using Robust.Shared.Console;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+
+namespace Content.Server.Power
+{
+    [AdminCommand(AdminFlags.Admin)]
+    public class SetBatteryPercentCommand : IConsoleCommand
+    {
+        public string Command => "setbatterypercent";
+        public string Description => "Drains or recharges a battery by entity uid and percentage, i.e.: forall with Battery do setbatterypercent $ID 0";
+        public string Help => $"{Command} <id> <percent>";
+
+        public void Execute(IConsoleShell shell, string argStr, string[] args)
+        {
+            if (args.Length != 2)
+            {
+                shell.WriteLine($"Invalid amount of arguments.\n{Help}");
+                return;
+            }
+
+            if (!EntityUid.TryParse(args[0], out var id))
+            {
+                shell.WriteLine($"{args[0]} is not a valid entity id.");
+                return;
+            }
+
+            if (!float.TryParse(args[1], out var percent))
+            {
+                shell.WriteLine($"{args[1]} is not a valid float (percentage).");
+                return;
+            }
+
+            var entityManager = IoCManager.Resolve<IEntityManager>();
+
+            if (!entityManager.TryGetComponent<BatteryComponent>(id, out var battery))
+            {
+                shell.WriteLine($"No battery found with id {id}.");
+                return;
+            }
+            battery.CurrentCharge = (battery.MaxCharge * percent) / 100;
+            // Don't acknowledge b/c people WILL forall this
+        }
+    }
+}