build: change to xmake mgr.

Server/xmake.lua

@@ -0,0 +1,15 @@
+add_rules("mode.debug", "mode.release")
+
+target("frelayServer")
+    set_rules("qt.console")
+    add_files("../Res/server.rc")
+    add_files("Server.cpp", "Server.h", "main.cpp")
+    add_deps("ClientCore")
+    add_deps("Protocol")
+    add_deps("Util")
+    add_frameworks("QtNetwork")
+    
+    if is_plat("mingw") then
+    else
+        add_deps("crashelper")
+    end