Fix windows fast-glob usage in lint-deps test task

* Introduce normalize-path wherever we use fastGlob

* CI: Update yarn version; install yarn via npm on windows

* Add more logging to Grunt file spectron usage

* Lock core.js to what it was resolving to before: 2.4.1

* test/index.html: Remove nonexistent test file

* test/index.html: Remove missing registration.js

* preload.js: Introduce client-side logging for load failures

* Gruntfile: Introduce better debuggability if prod test fails

* Reintroduce glob for searches inside asar

build/install-yarn.ps1

@@ -1,12 +0,0 @@
-# via https://gist.github.com/FeodorFitsner/1056703ec92bd6a3012c15fe78a5e162
-
-Write-Host "Installing Yarn..." -ForegroundColor Cyan
-
-Write-Host "Downloading..."
-$msiPath = "$env:TEMP\yarn.msi"
-(New-Object Net.WebClient).DownloadFile('https://github.com/yarnpkg/yarn/releases/download/v1.17.3/yarn-1.17.3.msi', $msiPath)
-
-Write-Host "Installing..."
-cmd /c start /wait msiexec /i "$msiPath" /quiet
-
-Write-Host "Yarn installed" -ForegroundColor Green