Updates to 3rd party libraries

Add Dockerfile and specific docker-php.ini

inc/vendor/markbaker/complex/classes/src/functions/cos.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ *
+ * Function code for the complex cos() function
+ *
+ * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
+ * @license    https://opensource.org/licenses/MIT    MIT
+ */
+namespace Complex;
+
+/**
+ * Returns the cosine of a complex number.
+ *
+ * @param     Complex|mixed    $complex    Complex number or a numeric value.
+ * @return    Complex          The cosine of the complex argument.
+ * @throws    Exception        If argument isn't a valid real or complex number.
+ */
+function cos($complex)
+{
+    $complex = Complex::validateComplexArgument($complex);
+
+    if ($complex->isReal()) {
+        return new Complex(\cos($complex->getReal()));
+    }
+
+    return conjugate(
+        new Complex(
+            \cos($complex->getReal()) * \cosh($complex->getImaginary()),
+            \sin($complex->getReal()) * \sinh($complex->getImaginary()),
+            $complex->getSuffix()
+        )
+    );
+}