Move default values to model package

pkg/model/defaults.go

@@ -0,0 +1,13 @@
+package model
+
+import (
+	"time"
+)
+
+const (
+	DefaultHostname     = "http://localhost"
+	DefaultFormat       = FormatVideo
+	DefaultQuality      = QualityHigh
+	DefaultPageSize     = 50
+	DefaultUpdatePeriod = 24 * time.Hour
+)