make tvshow navlink and pages and backend disableable with a command line parameter

apiGo/database/settings/Settings.go

@@ -0,0 +1,11 @@
+package settings
+
+var tvShowEnabled bool
+
+func TVShowsEnabled() bool {
+	return tvShowEnabled
+}
+
+func SetTVShowEnabled(enabled bool) {
+	tvShowEnabled = enabled
+}