Cleanup SI Unit classes and interface for REST responses; fixes to a few METAR parsing issues

app/Providers/MeasurementsProvider.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Providers;
+
+use Exception;
+use Illuminate\Support\Facades\Log;
+use Illuminate\Support\ServiceProvider;
+use PhpUnitsOfMeasure\Exception\DuplicateUnitNameOrAlias;
+use PhpUnitsOfMeasure\Exception\NonStringUnitName;
+use PhpUnitsOfMeasure\Exception\UnknownUnitOfMeasure;
+use PhpUnitsOfMeasure\PhysicalQuantity\Length;
+use PhpUnitsOfMeasure\PhysicalQuantity\Temperature;
+use PhpUnitsOfMeasure\UnitOfMeasure;
+
+/**
+ * Add new measurement units to PhpUnitsOfMeasure
+ */
+class MeasurementsProvider extends ServiceProvider
+{
+    public function boot(): void
+    {
+        try {
+            $this->addTemperatures();
+        } catch (Exception $e) {
+            Log::error($e);
+        }
+    }
+
+    /**
+     * Add lowercase temperature units
+     *
+     * @throws NonStringUnitName
+     * @throws UnknownUnitOfMeasure
+     */
+    protected function addTemperatures()
+    {
+        $fUnit = Temperature::getUnit('F');
+        $fUnit->addAlias('f');
+
+        $cUnit = Temperature::getUnit('C');
+        $cUnit->addAlias('c');
+    }
+}