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/ResearchClientBoundUserInterface.cs

@@ -1,6 +1,5 @@
 using Content.Shared.GameObjects.Components.Research;
 using Robust.Client.GameObjects.Components.UserInterface;
-using Robust.Client.UserInterface.Controls;
 using Robust.Shared.GameObjects.Components.UserInterface;
 
 namespace Content.Client.GameObjects.Components.Research