msbuild: use default Project attrs

maybe it makes the xml less scary :D

Source/Core/DolphinLib.ARM64.props

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <ItemGroup>
     <ClInclude Include="Common\Arm64Emitter.h" />
     <ClInclude Include="Common\ArmCommon.h" />

Source/Core/DolphinLib.props

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <ItemGroup>
     <ClInclude Include="AudioCommon\AudioCommon.h" />
     <ClInclude Include="AudioCommon\AudioStretcher.h" />

Source/Core/DolphinLib.vcxproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <Import Project="..\VSProps\Base.Macros.props" />
   <Import Project="$(VSPropsDir)Base.Targets.props" />
   <PropertyGroup Label="Globals">

Source/Core/DolphinLib.vcxproj.user

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

Source/Core/DolphinLib.x64.props

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <ItemGroup>
     <ClInclude Include="Common\x64ABI.h" />
     <ClInclude Include="Common\x64Emitter.h" />

Source/Core/DolphinNoGUI/DolphinNoGUI.vcxproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <Import Project="..\..\VSProps\Base.Macros.props" />
   <Import Project="$(VSPropsDir)Base.Targets.props" />
   <PropertyGroup Label="Globals">

Source/Core/DolphinNoGUI/DolphinNoGUI.vcxproj.filters

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <ItemGroup>
     <ClCompile Include="Platform.cpp" />
     <ClCompile Include="PlatformHeadless.cpp" />

Source/Core/DolphinQt/DolphinQt.vcxproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <Import Project="..\..\VSProps\Base.Macros.props" />
   <Import Project="$(VSPropsDir)Base.Targets.props" />
   <PropertyGroup Label="Globals">

Source/Core/DolphinQt/DolphinQt.vcxproj.user

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <LocalDebuggerCommand>$(BinaryOutputDir)$(TargetFileName)</LocalDebuggerCommand>
     <DebuggerFlavor>WindowsLocalDebugger</DebuggerFlavor>

Source/Core/DolphinTool/DolphinTool.filters

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <ItemGroup>
     <ClCompile Include="ConvertCommand.cpp" />
     <ClCompile Include="VerifyCommand.cpp" />

Source/Core/DolphinTool/DolphinTool.vcxproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <Import Project="..\..\VSProps\Base.Macros.props" />
   <Import Project="$(VSPropsDir)Base.Targets.props" />
   <PropertyGroup Label="Globals">

Source/Core/WinUpdater/WinUpdater.vcxproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <Import Project="..\..\VSProps\Base.Macros.props" />
   <Import Project="$(VSPropsDir)Base.Targets.props" />
   <PropertyGroup Label="Globals">

Source/Core/WinUpdater/WinUpdater.vcxproj.filters

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
   <ItemGroup>
     <ClCompile Include="Main.cpp" />
     <ClCompile Include="WinUI.cpp" />