Updated commands to have optional aliases, and to fallback to /pluginName:cmdName on name conflict.

By: VictorD <victor.danell@gmail.com>

paper-api/src/main/java/org/bukkit/command/Command.java

@@ -0,0 +1,52 @@
+package org.bukkit.command;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.bukkit.entity.Player;
+
+public abstract class Command {
+    private final String name;
+    private List<String> aliases;
+    protected String tooltip = "";
+    protected String usageMessage;
+
+    public Command(String name) {
+        this.name = name;
+        this.aliases = new ArrayList<String>();
+        this.usageMessage = "/" + name;
+    }
+
+    public abstract boolean execute(Player player, String currentAlias, String[] args);
+    
+    public String getName() {
+        return name;
+    }
+    
+    public List<String> getAliases() {
+        return aliases;
+    }
+
+    public String getTooltip() {
+        return tooltip;
+    }
+
+    public String getUsage() {
+        return usageMessage;
+    }
+    
+    public Command setAliases(List<String> aliases) {
+        this.aliases = aliases;
+        return this;
+    }
+    
+    public Command setTooltip(String tooltip) {
+        this.tooltip = tooltip;
+        return this;
+    }
+    
+    public Command setUsage(String usage) {
+        this.usageMessage = usage;
+        return this;
+    }
+}