Create Paper stubs for completions/contexts

This is so others can extend these, and auto get anything added in future

src/main/java/co/aikar/commands/BukkitCommandManager.java

@@ -30,12 +30,13 @@ import org.bukkit.plugin.Plugin;
 
 import java.util.Map;
 
+@SuppressWarnings("WeakerAccess")
 public class BukkitCommandManager implements CommandManager {
 
     @SuppressWarnings("WeakerAccess")
     protected final Plugin plugin;
-    private CommandContexts contexts;
-    private CommandCompletions completions;
+    protected CommandContexts contexts;
+    protected CommandCompletions completions;
 
     public BukkitCommandManager(Plugin plugin) {
         this.plugin = plugin;

src/main/java/co/aikar/commands/PaperCommandCompletions.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2016-2017 Daniel Ennis (Aikar) - MIT License
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining
+ *  a copy of this software and associated documentation files (the
+ *  "Software"), to deal in the Software without restriction, including
+ *  without limitation the rights to use, copy, modify, merge, publish,
+ *  distribute, sublicense, and/or sell copies of the Software, and to
+ *  permit persons to whom the Software is furnished to do so, subject to
+ *  the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be
+ *  included in all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package co.aikar.commands;
+
+@SuppressWarnings("WeakerAccess")
+public class PaperCommandCompletions extends BukkitCommandCompletions {
+}

src/main/java/co/aikar/commands/PaperCommandContexts.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2016-2017 Daniel Ennis (Aikar) - MIT License
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining
+ *  a copy of this software and associated documentation files (the
+ *  "Software"), to deal in the Software without restriction, including
+ *  without limitation the rights to use, copy, modify, merge, publish,
+ *  distribute, sublicense, and/or sell copies of the Software, and to
+ *  permit persons to whom the Software is furnished to do so, subject to
+ *  the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be
+ *  included in all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package co.aikar.commands;
+
+@SuppressWarnings("WeakerAccess")
+public class PaperCommandContexts extends BukkitCommandContexts {
+}

src/main/java/co/aikar/commands/PaperCommandManager.java

@@ -25,10 +25,27 @@ package co.aikar.commands;
 
 import org.bukkit.plugin.Plugin;
 
+@SuppressWarnings("WeakerAccess")
 public class PaperCommandManager extends BukkitCommandManager {
 
     // If we get anything Paper specific
     public PaperCommandManager(Plugin plugin) {
         super(plugin);
     }
+
+    @Override
+    public CommandContexts getCommandContexts() {
+        if (this.contexts == null) {
+            this.contexts = new PaperCommandContexts();
+        }
+        return this.contexts;
+    }
+
+    @Override
+    public CommandCompletions getCommandCompletions() {
+        if (this.completions == null) {
+            this.completions = new PaperCommandCompletions();
+        }
+        return this.completions;
+    }
 }