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.Client/GameObjects/Components/Research/TechnologyDatabaseComponent.cs

@@ -4,7 +4,6 @@ using Content.Shared.Research;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Prototypes;
-using SixLabors.ImageSharp.Processing;
 
 namespace Content.Client.GameObjects.Components.Research
 {