The following refactor was brought about because we (Age Partnership)
were running into difficulty using Squirrel in the Azure DevOps Build
Pipelines and existing logging wasn't sufficient for our needs.

I don't expect any functionality to have changed.

The Releasify method in Update.exe has been broken up into;

* ensureConsole
* ReleasifyValidateBaseUrl
* ReleasifyValidatePaths
* ReleasifyPrepareFiles
* ReleasifyProcessFiles
* ReleasifyCleanupFiles
* ReleasifyWriteReleaseFile
* ReleasifyCreateSetupExe
* ReleasifyGenerateMsi

Breaking Releasify up into smaller methods allows stack traces to be
more useful when identifying issues.

The refactoring was done using ReSharper. Only significant change is the
use of `out var` declarations and passing variables using `ref`. I
expect a more significant refactor could make this cleaner.  Debug logs have
been added to the start of each method and the whole Releasify method is now
in a "try / catch / log / throw" block.

This reverts commit d3b0deb.