* Add build command for generating the new boot JSON file
* Remove build command for generating index.html
* Update build targets to generate blazor.boot.json
* Change SPA fallback routing to look for index.html in regular wwwroot. Will need to update setup for published apps later.
* Stop autorebuild when index.html changes, since we no longer 'build' that file
* Update Boot.WebAssembly.ts logic to use boot JSON info on startup
* Restore support for loading CSS/JS from Blazor library projects
* Use new startup script tag in all samples and templates
* Fix MonoSanity sample - it must now be an exe because we use that as the trigger to generate the boot json (not the presence of index.html any more)
* Fix SPA fallback routing for published apps
Because in a previous commit, I changed it to look for index.html inside "wwwroot" instead of "dist" (because we no longer build it). But "wwwroot" doesn't exist for published apps, because static file servers wouldn't understand it.
* CR: Fix path normalization
Steve Sanderson
Eugene Bekker