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/PluginCommand.java

@@ -0,0 +1,33 @@
+package org.bukkit.command;
+
+import java.awt.Color;
+
+import org.bukkit.ChatColor;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
+public final class PluginCommand extends Command {
+    private final Plugin owningPlugin;
+
+    public PluginCommand(String name, Plugin owner) {
+        super(name);
+        this.owningPlugin = owner;
+        this.usageMessage = "";
+    }
+
+    public boolean execute(Player player, String commandLabel, String[] args) {
+        boolean cmdSuccess = owningPlugin.onCommand(player, this, commandLabel, args);
+        if (!cmdSuccess && usageMessage != "") {
+            String tmpMsg = usageMessage.replace("<command>", commandLabel);
+            String[] usageLines = tmpMsg.split("\\n");
+            for(String line: usageLines) {
+                while (line.length() > 0) {
+                    int stripChars = (line.length() > 53 ? 53:line.length());
+                    player.sendMessage(ChatColor.RED + line.substring(0, stripChars));
+                    line = line.substring(stripChars);
+                }
+            }
+        }
+        return cmdSuccess;
+    }
+}