feat(fax): Fax machines print, copy, and send paper labels (#25979)

* feat(fax): Client fax file-print parses and stores label

* feat(fax): Fax machines print, copy, and send paper labels

* style(Fax): Comments and formatting

* feat(fax): Make fax admin logging more consistent and clear

* refactor(fax): Replace ternary with a simpler null coalescing

* refactor(fax): Make FaxSystem Send method signature consistent with Copy, PrintFile

* refactor(fax): Read entire file and process later instead of peeking first

* refactor(fax): Remove local variables only used for style

* style(fax): Fix some nearby style errors

* fix(fax): Undo an inaccurate change to admin log formatting

* refactor(fax): Separate `firstLine` variable

* fix(fax): Use Environment.NewLine

* bienvenidos

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Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/Fax/FaxConstants.cs

@@ -23,6 +23,7 @@ public static class FaxConstants
 
     public const string FaxNameData = "fax_data_name";
     public const string FaxPaperNameData = "fax_data_title";
+    public const string FaxPaperLabelData = "fax_data_label";
     public const string FaxPaperPrototypeData = "fax_data_prototype";
     public const string FaxPaperContentData = "fax_data_content";
     public const string FaxPaperStampStateData = "fax_data_stamp_state";