Description of Change

Closes #15591. Adds support for showAboutPanel() and setAboutPanelOptions() on Windows.

Windows doesn't have a native About dialog. This PR reuses the electron::ShowMessageBox function to generate a dialog with the About Panel information as a string message.

Notes:

• Default settings are the applicationName and applicationVersion provided by /src/base/file_version_info.h.
• The image path accepts any file types that NativeImage API does.
• The About panel is synchronous (same as on Linux).

Fields added (all optional):

• applicationName: string
• applicationVersion: string
• copyright: string
• credits: string
• iconPath: string

cc @codebytere @ckerr @sindresorhus

Example

Additional Reading

Microsoft UX Guidelines for Dialog Boxes: https://docs.microsoft.com/en-us/windows/win32/uxguide/win-dialog-box

Relevant bits:

• Use an icon in About Box dialogs for application branding.
  
  In this example, a bitmap is used in the About Box to identify and brand the application.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• relevant documentation is changed or added
• PR title follows semantic commit guidelines
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Added about panel customization on Windows.