windows: Unify project file headers.

The xmlns attribute is required for older msbuild version (e.g. for
VS2015).  Add it where needed, and reorder the attributes so all
files look the same.

Author: stinos

mpy-cross/mpy-cross.vcxproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="14.0" DefaultTargets="Build">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>

ports/windows/micropython.vcxproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="14.0" DefaultTargets="Build">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>

ports/windows/msvc/genhdr.targets

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="GenerateHeaders">
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="14.0" DefaultTargets="GenerateHeaders">
 
   <Import Project="paths.props" Condition="'$(PyPathsIncluded)' != 'True'"/>
 

ports/windows/msvc/sources.props

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="14.0">
   <Import Project="paths.props" Condition="'$(PyPathsIncluded)' != 'True'"/>
   <ItemGroup>
     <PyCoreSource Include="$(PyBaseDir)py\*.c" />

ports/windows/variants/dev/mpconfigvariant.props

@@ -1,4 +1,5 @@
-<Project>
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="14.0">
   <PropertyGroup>
     <PyProg>micropython-dev</PyProg>
   </PropertyGroup>

ports/windows/variants/standard/mpconfigvariant.props

@@ -1,4 +1,5 @@
-<Project>
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="14.0">
   <PropertyGroup>
     <PyProg>micropython</PyProg>
   </PropertyGroup>