Add print method to PMatrix interface

Added a default method to print matrix data.

Author: Sumamasonia

core/src/processing/core/PMatrix.java

@@ -205,4 +205,10 @@ public void preApply(float n00, float n01, float n02, float n03,
    * @return the determinant of the matrix
    */
   public float determinant();
+  /**
+   * Print the matrix data to the console.
+   */
+  default void print() {
+    System.out.println(this);
+  }
 }