Switch Sandcastle Helpfile Builder to NuGet Package

https://ewsoftware.github.io/SHFB/html/50ad2c8c-5004-4b4c-a77f-97b8c403c9f2.htm
https://www.nuget.org/packages?q=EWSoftware.SHFB
https://www.nuget.org/packages/EWSoftware.SHFB/2014.11.22
Note, the Help1-Tools must still be installed on the system.

To build Help 1 output, the required help compiler tools and components must be installed separately. Help file builds using that formats will fail if those components are not installed.

HTML Help 1 Installer (HTML Help Workshop): https://www.microsoft.com/en-us/download/details.aspx?id=21138

Maybe, it is possible to just use a copy&paste deploy of the help file compiler:

• see https://github.com/EWSoftware/SHFB/blob/ea37113a5aa5e6d998213d37f43cc4f49acac2a7/SHFB/Source/SandcastleBuilderUtils/MSBuild/Build1xHelpFile.cs

• HelpCompilerFolder

• C:\Program Files (x86)\HTML Help Workshop\hhc.exe

• https://github.com/EWSoftware/SHFB/blob/ea37113a5aa5e6d998213d37f43cc4f49acac2a7/SHFB/Source/SandcastleBuilderUtils/Templates/Build1xHelpFile.proj