Add PlayerProfile API to replace GameProfile

This simply provides the base API to create the objects. Further commits will come that adds
adds usage of this API to existing GameProfile based API's, as well as new API's.

Spigot-Server-Patches/0223-Implement-ensureServerConversions-API.patch

@@ -1,27 +0,0 @@
-From e12cc521c629a1d8a05a229794658dd2962c8c64 Mon Sep 17 00:00:00 2001
-From: Aikar <aikar@aikar.co>
-Date: Wed, 4 May 2016 22:43:12 -0400
-Subject: [PATCH] Implement ensureServerConversions API
-
-This will take a Bukkit ItemStack and run it through any conversions a server process would perform on it,
-to ensure it meets latest minecraft expectations.
-
-diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
-index 49ebad22..eb698733 100644
---- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
-+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
-@@ -194,4 +194,11 @@ public final class CraftItemFactory implements ItemFactory {
-     public Color getDefaultLeatherColor() {
-         return DEFAULT_LEATHER_COLOR;
-     }
-+
-+    // Paper start
-+    @Override
-+    public ItemStack ensureServerConversions(ItemStack item) {
-+        return CraftItemStack.asCraftMirror(CraftItemStack.asNMSCopy(item));
-+    }
-+    // Paper end
- }
--- 
-2.14.3
-