GH-4071 handle network errors when logging in with MSA as 'soft'

This makes the tokens not expire when such errors happen.

Only applies to MSA, not the XBox and Mojang steps afterwards.
Further testing and improvements are still needed.

libraries/katabasis/include/katabasis/Bits.h

@@ -10,7 +10,11 @@ enum class Activity {
     Idle,
     LoggingIn,
     LoggingOut,
-    Refreshing
+    Refreshing,
+    FailedSoft, //!< soft failure. this generally means the user auth details haven't been invalidated
+    FailedHard, //!< hard failure. auth is invalid
+    FailedGone, //!< hard failure. auth is invalid, and the account no longer exists
+    Succeeded
 };
 
 enum class Validity {