Update build dependencies

appveyor.yml

@@ -1,14 +1,14 @@
 version: '{build}'
 os: Visual Studio 2019 Preview
 install:
-    - set PATH=%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\;%PATH%
+    - set PATH=%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Preview\MSBuild\Current\Bin\;%PATH%
     - ps: Install-Product node 10
     - npm install --global npm
     - ps: |
         Write-Host "Installing .NET Core SDK..." -ForegroundColor Cyan
         Write-Host "Downloading..."
         $exePath = "$env:TEMP\dotnet-sdk.exe"
-        (New-Object Net.WebClient).DownloadFile('https://download.visualstudio.microsoft.com/download/pr/31b5b67f-b787-4f73-a728-5ec61f10a4de/be6430bcd9a62f610cd9f12f8cc2c736/dotnet-sdk-3.0.100-preview3-010431-win-x64.exe', $exePath)
+        (New-Object Net.WebClient).DownloadFile('https://download.visualstudio.microsoft.com/download/pr/4032ceb5-61cd-495a-ab25-475aa2232f28/7eb614e777d87ef0d49f86be4fc8bbde/dotnet-sdk-3.0.100-preview4-011223-win-x64.exe', $exePath)
         Write-Host "Installing..."
         cmd /c start /wait "$exePath" /quiet /norestart
         del $exePath

azure-pipelines.yml

@@ -18,7 +18,7 @@ steps:
     - task: DotNetCoreInstaller@0
       inputs:
         packageType: 'sdk'
-        version: '3.0.100-preview3-010431' 
+        version: '3.0.100-preview4-011223'
 
     - task: VSBuild@1
       inputs:

runs-msbuild.bat

@@ -4,9 +4,10 @@ set BUILDTYPE="%~1"
 set ACTION="%~2"
 
 for %%s in (
-    "%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\MSBuild.exe"
-    "%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin\MSBuild.exe"
-    "%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin\MSBuild.exe"
+    "%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin\MSBuild.exe"
+    "%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Enterprise\MSBuild\Current\Bin\MSBuild.exe"
+    "%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Bin\MSBuild.exe"
+    "%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Preview\MSBuild\Current\Bin\MSBuild.exe"
 ) do (
     if exist %%s (
         echo %%s build.proj %ACTION% %BUILDTYPE%