Finish front-end server modification changes.

Everything is back to the point that it was before this massive code overhaul began. FInal steps before merging this into develop will be some unit tests.

app/Contracts/Repository/EggVariableRepositoryInterface.php

@@ -9,6 +9,16 @@
 
 namespace Pterodactyl\Contracts\Repository;
 
+use Illuminate\Support\Collection;
+
 interface EggVariableRepositoryInterface extends RepositoryInterface
 {
+    /**
+     * Return editable variables for a given egg. Editable variables must be set to
+     * user viewable in order to be picked up by this function.
+     *
+     * @param int $egg
+     * @return \Illuminate\Support\Collection
+     */
+    public function getEditableVariables(int $egg): Collection;
 }