Add pen transparency blocks back into toolbox

src/lib/make-toolbox-xml.js

@@ -332,6 +332,20 @@ const pen = `
                 </shadow>
             </value>
         </block>
+        <block type="pen_changepentransparencyby" id="pen_changepentransparencyby">
+            <value name="TRANSPARENCY">
+                <shadow type="math_number">
+                    <field name="NUM">10</field>
+            </shadow>
+          </value>
+        </block>
+        <block type="pen_setpentransparencyto" id="pen_setpentransparencyto">
+            <value name="TRANSPARENCY">
+                <shadow type="math_number">
+                    <field name="NUM">50</field>
+                </shadow>
+            </value>
+        </block>
     </category>
 `;