Basis for the job system (#434)

* Add basic yaml Jobs file

* Add Job Prototype

* Rename Jobs to Job

* Remove BaseJob

* Add the Job class child of Role

* Add code for spawning as an assistant. Not actually working, the job prototype can't be found.

* Fix role instead of job left in yaml

* Add starting gear support for job and the starting gear for assistant as an exemple

* Link job with starting gear in yaml

* Better naming and some error handling

* Tweak error handling

Content.Shared/Jobs/JobPrototype.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Utility;
+using YamlDotNet.RepresentationModel;
+
+namespace Content.Shared.Jobs
+{
+    [Prototype("job")]
+    public class JobPrototype : IPrototype, IIndexedPrototype
+    {
+        public string ID { get; private set; }
+        public string Name { get; private set; }
+
+        public string StartingGear { get; private set; }
+        public IEnumerable<string> Department { get; private set; }
+
+        public void LoadFrom(YamlMappingNode mapping)
+        {
+            ID = mapping.GetNode("id").AsString();
+            Name = mapping.GetNode("name").ToString();
+            StartingGear = mapping.GetNode("startingGear").ToString();
+            Department = mapping.GetNode("department").AllNodes.Select(i => i.ToString());
+        }
+    }
+}

Content.Shared/Jobs/StartingGearPrototype.cs

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+using System;
+using System.Collections.Generic;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization;
+using Robust.Shared.ViewVariables;
+using YamlDotNet.RepresentationModel;
+
+namespace Content.Shared.Jobs
+{
+    [Prototype("startingGear")]
+    public class StartingGearPrototype : IPrototype, IIndexedPrototype
+    {
+        private string _id;
+        private Dictionary<string, string> _equipment;
+
+        [ViewVariables]
+        public string ID => _id;
+
+        [ViewVariables]
+        public Dictionary<string, string> Equipment => _equipment;
+
+        public void LoadFrom(YamlMappingNode mapping)
+        {
+            var serializer = YamlObjectSerializer.NewReader(mapping);
+
+            serializer.DataField(ref _id, "id", string.Empty);
+            serializer.DataField(ref _equipment, "equipment", new Dictionary<string, string>());
+        }
+    }
+}