Rider static analysis (#433)

* Non-accessed local variable

* Merge cast and type checks.

* StringComparison.Ordinal added for better culture support

* Supposed code improvement in launcher. Remove unused code.

* Update ExplosionHelper.cs

Unintentional change.

* Optimized Import

* Add Robust.Shared.Utility import where it was deleted

* Other random suggestion

* Improve my comment

Content.Server/GameObjects/Components/Medical/MedicalScannerComponent.cs

@@ -1,8 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Security.Cryptography.X509Certificates;
-using Content.Server.GameObjects.Components.Items.Storage;
 using Content.Server.GameObjects.EntitySystems;
 using Content.Shared.GameObjects;
 using Content.Shared.GameObjects.Components.Medical;