Refactor, add extensive README.md, add future planning

src/Tool/Tool.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Tool;
+
+class Tool
+{
+	public int $T;  // Tool number
+	public int $X;  // Radius in 0.001 mm
+	public int $Z;  // Length offset in 0.002 mm
+
+
+	public function __construct(int $T, int $X, int $Z)
+	{
+		$this->T = $T;
+		$this->X = $X;
+		$this->Z = $Z;
+	}
+}