Make autoload exception more specific (#777)

This is a nice-to-have ([as I'm currently overriding it](https://github.com/psalm/laravel-psalm-plugin/commit/a700c89061d151d1c08851abd93d834f9183534d)), but might help other packages.

src/Console/MetaCommand.php

@@ -135,7 +135,7 @@ class MetaCommand extends Command
     protected function registerClassAutoloadExceptions()
     {
         spl_autoload_register(function ($class) {
-            throw new \Exception("Class '$class' not found.");
+            throw new \ReflectionException("Class '$class' not found.");
         });
     }
 

src/Console/ModelsCommand.php

@@ -453,7 +453,7 @@ class ModelsCommand extends Command
                     //Use reflection to inspect the code, based on Illuminate/Support/SerializableClosure.php
                     $reflection = new \ReflectionMethod($model, $method);
                     // php 7.x type or fallback to docblock
-                    $type = (string) $reflection->getReturnType() ?: $this->getReturnTypeFromDocBlock($reflection);
+                    $type = (string) $reflection->getReturnType() ?: (string)$this->getReturnTypeFromDocBlock($reflection);
 
                     $file = new \SplFileObject($reflection->getFileName());
                     $file->seek($reflection->getStartLine() - 1);
@@ -480,7 +480,7 @@ class ModelsCommand extends Command
                                'morphedByMany' => '\Illuminate\Database\Eloquent\Relations\MorphToMany'
                              ) as $relation => $impl) {
                         $search = '$this->' . $relation . '(';
-                        if (stripos($code, $search) || stripos($impl, $type) !== false) {
+                        if (stripos($code, $search) || stripos($impl, (string)$type) !== false) {
                             //Resolve the relation's model to a Relation object.
                             $methodReflection = new \ReflectionMethod($model, $method);
                             if ($methodReflection->getNumberOfParameters()) {