* Move MapPathWebRoot & MapPathContentRoot to extension methods.
* Set AspNetCoreHostingEnvironment ApplicationId without service provider.
* Drop some usages of TempHostingEnvironment
* Logging setup cleanup - AppDomainId has no value (it is always "1")
Creating new AppDomains isn't possible in .Net core.
Attempting to do so results in a platform exception.
A dotnet core process has a single AppDomain instance whose Id property
is always the integer 1.
* Setup logging without IHostingEnvironment
* Mark IUmbracoBuilder.BuilderHostingEnvironment obsolete
And remove internal usages.
* Typeloader no longer uses umbraco-types.list
* Added UmbracoHost - setup serilog two-stage init.
* Add ApplicationIdEnricher
* Defensive tweaks for those not using UmbracoHost
* Drop UmbracoHost static class
* Setup runtime logger without host builder extensions.
* Prevent RefreshingRazorViewEngine related explosions
* Filescoped namespaces for new classes.
* Apply suggestions from code review
