GasFilterComponent (#2935)

* GasFilterComponent

* Client ignore component

* Diff fixes

* diff fix 2

Co-authored-by: py01 <pyronetics01@gmail.com>

Content.Shared/Atmos/Atmospherics.cs

@@ -1,4 +1,6 @@
-using Robust.Shared.Maths;
+using Robust.Shared.Maths;
+using Robust.Shared.Serialization;
+using System;
 
 namespace Content.Shared.Atmos
 {
@@ -246,6 +248,7 @@ namespace Content.Shared.Atmos
     /// <summary>
     ///     Gases to Ids. Keep these updated with the prototypes!
     /// </summary>
+    [Serializable, NetSerializable]
     public enum Gas : sbyte
     {
         Oxygen = 0,