Add SQL Server Data Tools extensions to VS2019 (#559)

* add extensions

* add exe installation

* change Reporting Services name

* add switch to function, add validation

* change install wdk to function

* Fix template

* fix scripts name

* add quotes

* more quotes

* one more quotes

* get rid of duplicate code

* move quotes to function

* small improvment to wix installation

* add comment to validate extensions script

images/win/scripts/Installers/Install-Wix.ps1

@@ -0,0 +1,23 @@
+################################################################################
+##  File:  Install-Wix.ps1
+##  Desc:  Install WIX.
+################################################################################
+
+Import-Module -Name ImageHelpers -Force;
+
+choco install wixtoolset -y --force
+
+if(Test-IsWin19)
+{
+    $extensionUrl = "https://wixtoolset.gallerycdn.vsassets.io/extensions/wixtoolset/wixtoolsetvisualstudio2019extension/1.0.0.4/1563296438961/Votive2019.vsix"
+    $VSver = "2019"
+}
+else
+{
+    $extensionUrl = "https://robmensching.gallerycdn.vsassets.io/extensions/robmensching/wixtoolsetvisualstudio2017extension/0.9.21.62588/1494013210879/250616/4/Votive2017.vsix"
+    $VSver = "2017"
+}
+
+$extensionName = "Votive$VSver.vsix"
+#Installing VS extension 'Wix Toolset Visual Studio Extension'
+Install-VsixExtension -Url $extensionUrl -Name $extensionName -VSversion $VSver