New 'timeouts' directive to configure timeouts; default timeouts enabled (#1368)

caddyhttp/httpserver/plugin.go

@@ -415,7 +415,8 @@ var directives = []string{
 	// primitive actions that set up the fundamental vitals of each config
 	"root",
 	"bind",
-	"maxrequestbody",
+	"maxrequestbody", // TODO: 'limits'
+	"timeouts",
 	"tls",
 
 	// services/utilities, or other directives that don't necessarily inject handlers