Add METAR interface and use local library for decoding

app/Support/Units/Temperature.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Support\Units;
+
+use Illuminate\Contracts\Support\Arrayable;
+
+/**
+ * Wrap the converter class
+ * @package App\Support\Units
+ */
+class Temperature extends \PhpUnitsOfMeasure\PhysicalQuantity\Temperature implements Arrayable
+{
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        $unit = strtoupper(setting('units.temperature'));
+        $value = $this->toUnit($unit);
+
+        return (string) round($value, 2);
+    }
+
+    /**
+     * Return value in native unit as integer
+     * @return array
+     */
+    public function toNumber()
+    {
+        return $this->toArray();
+    }
+
+    /**
+     * For the HTTP Resource call
+     */
+    public function toObject()
+    {
+        return [
+            'f' => round($this->toUnit('F'), 2),
+            'c'  => round($this->toUnit('C') / 1000, 2),
+        ];
+    }
+
+    /**
+     * Get the instance as an array.
+     */
+    public function toArray()
+    {
+        return $this->__toString();
+    }
+}