Update core. Refactor error logging code.

Main.go

@@ -21,10 +21,6 @@ var config struct {
 	// Warning: These settings are currently overwritten (deleted) when the config file is updated by core.
 	// In the future the core package will consider custom config fields.
 
-	// Log settings
-	ErrorOutput int  `yaml:"ErrorOutput"` // 0 = Log file (default),  1 = Command line, 2 = Log file + command line, 3 = None
-	DebugAPI    bool `yaml:"DebugAPI"`    // Enables the debug API which allows profiling. Do not enable in production. Only available if compiled with debug tag.
-
 	// API settings
 	APIListen          []string  `yaml:"APIListen"`          // WebListen is in format IP:Port and declares where the web-interface should listen on. IP can also be ommitted to listen on any.
 	APIUseSSL          bool      `yaml:"APIUseSSL"`          // Enables SSL.
@@ -33,6 +29,7 @@ var config struct {
 	APITimeoutRead     string    `yaml:"APITimeoutRead"`     // The maximum duration for reading the entire request, including the body.
 	APITimeoutWrite    string    `yaml:"APITimeoutWrite"`    // The maximum duration before timing out writes of the response. This includes processing time and is therefore the max time any HTTP function may take.
 	APIKey             uuid.UUID `yaml:"APIKey"`             // API key. Empty UUID 00000000-0000-0000-0000-000000000000 = not used.
+	DebugAPI           bool      `yaml:"DebugAPI"`           // Enables the debug API which allows profiling. Do not enable in production. Only available if compiled with debug tag.
 }
 
 func init() {
@@ -57,7 +54,6 @@ func main() {
 	userAgent := appName + "/" + core.Version
 
 	filters := &core.Filters{
-		LogError:               logError,
 		DHTSearchStatus:        filterSearchStatus,
 		IncomingRequest:        filterIncomingRequest,
 		MessageIn:              filterMessageIn,