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.Shared/GameObjects/Components/Research/SharedTechnologyDatabaseComponent.cs

@@ -3,9 +3,7 @@ using System.Collections;
 using System.Collections.Generic;
 using Content.Shared.Research;
 using Robust.Shared.GameObjects;
-using Robust.Shared.GameStates;
 using Robust.Shared.IoC;
-using Robust.Shared.Log;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization;