Update stub executable for brave/Squirrel.Windows

[bsclifton]

This is a Windows specific task

When Squirrel updates are done for the browser-laptop product, replacement executables are downloaded (including the binary for the stub installer)

The proposed updates (below) will accomplish the following:

• Folks that have default browser set as the Muon browser will now have Brave Core as the default
• Existing shortcuts for the Muon product will launch into Brave Core (desktop, pinned to taskbar)
• When automated install of brave-core is done, it can simply do an app.relaunch and the --import-from-muon (or similar) args should get propagated through to brave-core

This task involves the following steps:

• Update our fork of Squirrel.Windows - the Squirrel stub executable needs to have the following logic:
  • check LOCAL install registry key at HKEY_CURRENT_USER\Software\BraveSoftware\Update\path
  • If key exists, modify path (to find application); replace Update\BraveUpdate.exe with Brave-Browser\Application\brave.exe
  • If this file exists, launch into this - DONE
  • If this key DOES NOT exist, check HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\BraveSoftware\Update\path
  • If key exists, modify path (to find application); replace Update\BraveUpdate.exe with Brave-Browser\Application\brave.exe
  • If this file exists, launch into this - DONE
  • If no registry keys were found, fall back to default behavior (load highest version app-X folder from directory stub installer lives in (ex: %USERPROFILE%\AppData\Local\brave\) - DONE
• Update the executables in Muon Winstaller to have the new StubExecutable.exe
• Update Muon Winstaller dependency in browser-laptop
• Update product name (if possible) to Brave (old) or Brave (Muon)

[bsclifton]

Part one (Squirrel.Windows) implemented with brave/Squirrel.Windows#5

[bsclifton]

Part two (muon-winstaller) implemented with brave/muon-winstaller#7

[bsclifton]

For part four (product name), I have been able to successfully change the name that shows in Add / Remove Programs

However, I need to find the string that shows in the Default app settings screen (this is what it looks like now): 🙀

[bsclifton]

Found it! Key is located at HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\Shell\MuiCache\C:\Users\clifton\AppData\Local\Brave\Brave.exe.FriendlyAppName

Changes to this will get overwritten though - so the proper way to make this change is to create a key like so:

[HKEY_CLASSES_ROOT\Applications\Brave.exe\shell\open]
"FriendlyAppName"="Brave (old)"

[bsclifton]

All work is complete here- contained in the following branch:
https://github.com/brave/browser-laptop/tree/muon-upgrade-windows