[TASK] Introduced addLine() to the buffer class.

[TASK] Made createBuffer function protected in ProtocolHandler classes.

Classes/Misc/Buffer.php

@@ -59,6 +59,16 @@ class Misc_Buffer {
 		$this->pruneEmptyLines();
 	}
 
+	/**
+	 * Appends data + linebreak to the buffer.
+	 * @param string $data
+	 * @return void
+	 */
+	public function addLine($data) {
+		$this->buffer .= $data . $this->linebreak;
+		$this->pruneEmptyLines();
+	}
+
 	/**
 	 * Returns the next line in the buffer and removes it from the buffer.
 	 * @return string