Added header, updated external properties

Author: D0tNet4Fun

MSBuild/CustomOutputPathExtension/After.CustomOutputPath.targets

@@ -1,7 +1,15 @@
-<!--EXTERNAL_PROPERTIES: BuildingInsideVisualStudio;BuildingByReSharper;UseVSHostingProcess;BaseOutputDrive;UseLinksInOutputDirectory;UsingCustomOutputPath;IsBaseOutputDriveAvailable -->
+<!--
+***********************************************************************************************
+After.CustomOutputPath.targets
 
-<!-- This runs after Microsoft.Common.targets -->
+WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and have
+          created a backup copy.  Incorrect changes to this file will make it
+          impossible to load or build your projects from the command-line or the IDE.
 
+***********************************************************************************************
+-->
+
+<!--EXTERNAL_PROPERTIES: BuildingInsideVisualStudio;BuildingInsideIDE;UseVSHostingProcess;BaseOutputPath;BaseOutputDrive;IsBaseOutputDriveAvailable;UseLinksInOutputDirectory;UsingCustomOutputPath;-->
 <!-- ReSharper disable UnknownTask -->
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 

MSBuild/CustomOutputPathExtension/Before.CustomOutputPath.targets

@@ -1,6 +1,15 @@
-<!--EXTERNAL_PROPERTIES: UseLinksInOutputDirectory-->
+<!--
+***********************************************************************************************
+Before.CustomOutputPath.targets
 
-<!-- This runs before Microsoft.Common.targets -->
+WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and have
+          created a backup copy.  Incorrect changes to this file will make it
+          impossible to load or build your projects from the command-line or the IDE.
+
+***********************************************************************************************
+-->
+
+<!--EXTERNAL_PROPERTIES: UseLinksInOutputDirectory;BuildingInsideVisualStudio;BuildingByReSharper-->
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 
   <Import Project=".\CustomOutputPath.props" />

MSBuild/CustomOutputPathExtension/CustomOutputPath.props

@@ -1,4 +1,15 @@
-<!-- This runs before Microsoft.Common.targets -->
+<!--
+***********************************************************************************************
+CustomOutputPath.props
+
+WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and have
+          created a backup copy.  Incorrect changes to this file will make it
+          impossible to load or build your projects from the command-line or the IDE.
+
+***********************************************************************************************
+-->
+
+<!-- This runs before Microsoft.Common.targets -->
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 
   <!--