Added preferences backend (#465)

* Added preferences backend

* Gender -> Sex

* ClientPreferencesManager properties

* Username validation

* Fixed client init

* WIP db

* Actually working sqlite db

* Dropped shitty sqlite libraries, dropped DbUp, added MigrationManager

* Added profile deletion, test

* Docs, sanity, tests, cleanup

* Cleaned up profile and appearance, fixed running on .net core

Co-authored-by: Pieter-Jan Briers <pieterjan.briers@gmail.com>

Content.Shared/Preferences/HumanoidCharacterAppearance.cs

@@ -0,0 +1,42 @@
+using System;
+using Robust.Shared.Maths;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Preferences
+{
+    [Serializable, NetSerializable]
+    public class HumanoidCharacterAppearance : ICharacterAppearance
+    {
+        public string HairStyleName { get; set; }
+        public Color HairColor { get; set; }
+        public string FacialHairStyleName { get; set; }
+        public Color FacialHairColor { get; set; }
+        public Color EyeColor { get; set; }
+        public Color SkinColor { get; set; }
+
+        public static HumanoidCharacterAppearance Default()
+        {
+            return new HumanoidCharacterAppearance
+            {
+                HairStyleName = "Bald",
+                HairColor = Color.Black,
+                FacialHairStyleName = "Shaved",
+                FacialHairColor = Color.Black,
+                EyeColor = Color.Black,
+                SkinColor = Color.Black
+            };
+        }
+
+        public bool MemberwiseEquals(ICharacterAppearance maybeOther)
+        {
+            if (!(maybeOther is HumanoidCharacterAppearance other)) return false;
+            if (HairStyleName != other.HairStyleName) return false;
+            if (HairColor != other.HairColor) return false;
+            if (FacialHairStyleName != other.FacialHairStyleName) return false;
+            if (FacialHairColor != other.FacialHairColor) return false;
+            if (EyeColor != other.EyeColor) return false;
+            if (SkinColor != other.SkinColor) return false;
+            return true;
+        }
+    }
+}