Add ARM platform & pugixml_arm, update VS solution

Upgrade solution to Visual Studio 17 and add ARM build configurations across projects. Several .vcxproj files were updated to include Debug/Release|ARM property groups, property sheet imports and LinkIncremental settings; platform toolset set for ARM configs where appropriate. A new pugixml_arm project and its sources/filters were added. Also added ExtensibilityGlobals (SolutionGuid) to the .sln.

pugixml_arm/pugixml_arm.cpp

@@ -0,0 +1,10 @@
+// pugixml_arm.cpp : 定义静态库的函数。
+//
+
+#include "pch.h"
+#include "framework.h"
+
+// TODO: 这是一个库函数示例
+void fnpugixmlarm()
+{
+}