build: change to xmake mgr.

xmake.lua

@@ -0,0 +1,43 @@
+add_rules("mode.debug", "mode.release")
+
+set_version("0.2.1", {build = "1"})
+
+if is_plat("windows") then
+    add_cxflags("/utf-8")
+end
+
+if is_plat("mingw") then
+    add_defines("NO_CRASHELPER=ON")
+end
+
+if has_config("xp") then
+    add_defines("_WIN32_WINNT=0x0501")
+else
+    add_defines("_WIN32_WINNT=0x0601")
+end
+
+add_defines("FMT_HEADER_ONLY")
+add_includedirs("3rd")
+
+if has_config("gui") then
+    includes("Gui", "3rd/SingleApplication-3.5.2")
+end
+
+add_includedirs("$(builddir)")
+add_configfiles("version.h.in", {filename = "fversion.h", outputdir = "$(builddir)"})
+includes("Struct", "Protocol", "Util", "ClientCore", "Console", "Server", "Test")
+
+if is_plat("mingw") then
+else
+    includes("crashelper")
+end
+
+option("xp")
+	set_default(false)
+	set_showmenu(true)
+    set_description("Enable Windows XP support")
+
+option("gui")
+    set_default(false)
+    set_showmenu(true)
+    set_description("Enable GUI support")