[5.3] Use studly case for controller names

[faustbrian]

At the moment all controllers that will be generated with php artisan make:model Post --controller have lower-case first letters because camel-case is used, this should fix this.

// Current
$controller = Str::camel(class_basename($this->argument('name')));
// postController

// New
$controller = Str::studly(class_basename($this->argument('name')));
// PostController