Add NSCopying, NSSecureCoding Support to Informational Classes (#17)

* Add NSCopying, NSSecureCoding Support to Informational Classes

* Remove Redundant Copies

* Revert out-of-context typo corrections

* Revert out-of-context changes

OpenVPN Adapter/OpenVPNSessionToken.h

@@ -11,7 +11,7 @@
 /**
  Class used to get session token from VPN core
  */
-@interface OpenVPNSessionToken : NSObject
+@interface OpenVPNSessionToken : NSObject <NSCopying, NSSecureCoding>
 
 @property (nullable, readonly, nonatomic) NSString *username;
 
@@ -20,6 +20,4 @@
  */
 @property (nullable, readonly, nonatomic) NSString *session;
 
-- (nonnull instancetype) __unavailable init;
-
 @end