380 vacentral library (#381)

* Update vaCentral library for new API server format

* Formatting

* Remove missing/unused import

config/app.php

@@ -84,7 +84,6 @@ return [
         App\Providers\AuthServiceProvider::class,
         App\Providers\EventServiceProvider::class,
         App\Providers\RouteServiceProvider::class,
-        App\Providers\vaCentralServiceProvider::class,
         App\Providers\ExtendedTimezonelistProvider::class,
         App\Providers\MeasurementsProvider::class,
         App\Providers\BindServiceProviders::class,