Added new custom header structure

+ Moved custom header rewrite to dpcore
+ Restructure dpcore header rewrite sequence
+ Added advance custom header settings (zoraxy to upstream and zoraxy to downstream mode)
+ Added header remove feature
+ Removed password requirement for SMTP #80
+ Completed stream proxy module (TCP and UDP)
+ Optimized UX for reminding user to click Apply after port change
+ Added version number to footer #160

src/mod/dynamicproxy/dynamicproxy.go

@@ -142,6 +142,7 @@ func (router *Router) StartProxyService() error {
 							OriginalHost: originalHostHeader,
 							UseTLS:       sep.RequireTLS,
 							PathPrefix:   "",
+							Version:      sep.parent.Option.HostVersion,
 						})
 						return
 					}