Description of Change

I identified a problem with missing icons on Windows. Electron PR /pull/48132 introduced COM activation. COM activation requires the ToastCLSID to be stored in a shortcut in the start menu. The PR enforces that shortcut creation. see EnsureShortcut()
Unfortunately this is not compatible with Squirrel auto-updating. The shortcut in C:\Users\<user>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs is created with the current executable. E.g. C:\Users\<user>\AppData\Local\my-app\app-1.0.0\myapp.exe An update will kick in and the new version is C:\Users\<user>\AppData\Local\my-app\app-2.0.0\mayapp.exe The shortcut will never be updated but C:\Users\<user>\AppData\Local\my-app\app-1.0.0\mayapp.exe  will be deleted when the next update comes in. Now the shortcut is dead and eventually Explorers icon cashing catches up to the missing exe and the shortcut and the executable no longer shows an icon in the taskbar.

This PR should fix this.

• detects changes in exe path and updates shortcut
• detects Stub / launcher layout: if the running binary lives under a versioned folder but a stub exists one directory up with the same filename (Squirrel.Windows & and wix-msi), the shortcut targets the stub so the path stays stable across updates and pinned shortcuts don't break.
• detects app folder version changes and updates working directories

However there are still some fundamental problems that are not addressed but would need some rethinking and API changes.

1. Apps might want to manage there own shortcuts in start menu. Squirrel packager for example creates shortcuts. Now we have duplicated shortcuts.
2. A more rare edge case is two apps have the same name and would fight with each other over the same shortcut.

Checklist

• PR description included
• I have built and tested this PR
• npm test passes
• tests are changed or added
• relevant API documentation, tutorials, and examples are updated and follow the documentation style guide
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Fixed an issue where an app shortcut may lose its icon after auto-updating on Windows.