Add base CommandIterator implementation (#819)

* Add base CommandIterator implementation

* Add check for invalid pos & finalize pr

plugins/include/console.inc

@@ -433,6 +433,52 @@ native int GetCmdArg(int argnum, char[] buffer, int maxlength);
  */
 native int GetCmdArgString(char[] buffer, int maxlength);
 
+methodmap CommandIterator < Handle {
+	// Creates a new CommandIterator. Must be freed with delete or
+	// CloseHandle().
+	//
+	// The CommandIterator can be used to iterate commands created by
+	// SourceMod plugins and allows inspection of properties associated
+	// with the command.
+	// 
+	// @return		 New CommandIterator Handle.
+	public native CommandIterator();
+
+	// Determines if there is a next command. If one is found, the
+	// iterator is advanced to it.
+	//
+	// @return		true if found and iterator is advanced.
+	public native bool Next();
+
+	// Retrieves the command's description.
+	//
+	// @param buffer		Buffer to copy to.
+	// @param maxlen		Maximum size of the buffer.
+	// @error				Invalid iterator position.
+	public native void GetDescription(char[] buffer, int maxlen);
+
+	// Retrieves the command's name.
+	//
+	// @param buffer		Buffer to copy to.
+	// @param maxlen		Maximum size of the buffer.
+	// @error				Invalid iterator position.
+	public native void GetName(char[] buffer, int maxlen);
+
+	// Retrieves the plugin handle of the command's creator
+	//
+	// @error				Invalid iterator position.
+	property Handle Plugin {
+		public native get();
+	}
+
+	// Retrieves the command's default flags
+	//
+	// @error				Invalid iterator position.
+	property int Flags {
+		public native get();
+	}
+}
+
 /**
  * Gets a command iterator.  Must be freed with CloseHandle().
  *