settings: new option to disable event fetch from server side

settings/settings.go

@@ -61,6 +61,8 @@ type FICSettings struct {
 	UnlockedChallengeDepth	int       `json:"unlockedChallengeDepth"`
 	// SubmissionUniqueness don't count multiple times identical tries.
 	SubmissionUniqueness    bool      `json:"submissionUniqueness"`
+	// EventKindness will ask browsers to delay notification interval.
+	EventKindness           bool      `json:"eventKindness"`
 }
 
 // ExistsSettings checks if the settings file can by found at the given path.