Add switch to skip help generation during build

Author: cormacpayne

build.proj

@@ -24,6 +24,9 @@
       'AzureStorage': storage data plane cmdlets
       'Subfolder under src\ResourceManager': An individual cmdlet module
       By default, it builds all
+
+    /p:SkipHelp=True
+      Skips help generation and installer creation, mainly for local builds to save time.
   -->
 
   <!-- Define build properties -->
@@ -44,6 +47,7 @@
     <BuildInParallel Condition="'$(BuildInParallel)' == ''">true</BuildInParallel>
     <NuGetPublishingSource Condition=" '$(NuGetPublishingSource)' == '' ">http://psget/PSGallery/api/v2/</NuGetPublishingSource>
     <Scope Condition=" $(Scope) == '' " >all</Scope>
+    <SkipHelp Condition =" '$(SkipHelp)' == '' ">false</SkipHelp>
   </PropertyGroup>
   <ItemGroup>
     <CmdletSolutionsToBuild Include=".\src\Storage\Storage.sln;.\src\ResourceManager\**\*.sln;.\src\ServiceManagement\ServiceManagement.sln;"
@@ -186,15 +190,18 @@
       BuildInParallel="$(BuildInParallel)"
       ContinueOnError="false" />   	
 
-    <Exec Command="$(PowerShellCommand) -NonInteractive -NoLogo -NoProfile -Command &quot;. $(LibraryToolsFolder)\GenerateHelp.ps1 -ValidateMarkdownHelp -GenerateMamlHelp -BuildConfig $(Configuration) &quot;" ContinueOnError="false"/>
+    <Exec Command="$(PowerShellCommand) -NonInteractive -NoLogo -NoProfile -Command &quot;. $(LibraryToolsFolder)\GenerateHelp.ps1 -ValidateMarkdownHelp -GenerateMamlHelp -BuildConfig $(Configuration) &quot;"
+    	ContinueOnError="false"
+    	Condition=" '$(SkipHelp)' == 'false' "/>
     <CallTarget Targets="BuildSetupTest"/>
 	<CallTarget Targets="CodeSignBinaries" Condition=" '$(CodeSign)' == 'true' " />	
 	<CallTarget Targets="BuildSetup"/>
 	<CallTarget Targets="CodeSignInstaller"
                 Condition=" '$(CodeSign)' == 'true' and '$(Scope)' == 'all'" />
 	<Message Importance="high" Text="Running Static Analyser" />
     <CallTarget targets="DependencyAnalysis" />
-    <Exec Command="$(PowerShellCommand) -NonInteractive -NoLogo -NoProfile -Command &quot;. $(LibraryToolsFolder)\CleanupBuild.ps1 -BuildConfig $(Configuration) &quot;"/>
+    <Exec Command="$(PowerShellCommand) -NonInteractive -NoLogo -NoProfile -Command &quot;. $(LibraryToolsFolder)\CleanupBuild.ps1 -BuildConfig $(Configuration) &quot;"
+    	Condition=" '$(SkipHelp)' == 'false' "/>
   </Target>
 
   <!-- Do everything possible -->