Suit sensor and crew monitoring (#5521)

Co-authored-by: Paul Ritter <ritter.paul1@googlemail.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/Medical/SuitSensor/SharedSuitSensor.cs

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+using System;
+using Content.Shared.FixedPoint;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Medical.SuitSensor
+{
+    [Serializable, NetSerializable]
+    public class SuitSensorStatus
+    {
+        public SuitSensorStatus(string name, string job)
+        {
+            Name = name;
+            Job = job;
+        }
+
+        public TimeSpan Timestamp;
+        public string Name;
+        public string Job;
+        public bool IsAlive;
+        public int? TotalDamage;
+        public MapCoordinates? Coordinates;
+    }
+
+    [Serializable, NetSerializable]
+    public enum SuitSensorMode : byte
+    {
+        /// <summary>
+        /// Sensor doesn't send any information about owner
+        /// </summary>
+        SensorOff = 0,
+
+        /// <summary>
+        /// Sensor sends only binary status (alive/dead)
+        /// </summary>
+        SensorBinary = 1,
+
+        /// <summary>
+        /// Sensor sends health vitals status
+        /// </summary>
+        SensorVitals = 2,
+
+        /// <summary>
+        /// Sensor sends vitals status and GPS position
+        /// </summary>
+        SensorCords = 3
+    }
+
+    public static class SuitSensorConstants
+    {
+        public const string NET_NAME = "name";
+        public const string NET_JOB = "job";
+        public const string NET_IS_ALIVE = "alive";
+        public const string NET_TOTAL_DAMAGE = "vitals";
+        public const string NET_CORDINATES = "cords";
+    }
+}