Add optional configuration steps to .msi installer

[thenextman]

Adds the basic configuration options from Devolutions Server Console directly to the Devolutions Gateway installer.

Customization via the installer is only available for new installs, and only if the user has PowerShell 5.1 at least. To configure an existing installation using the installer, the user must uninstall first before re-running the installer.

Options are configured in multiple steps with a summary page at the end. Each step is backed by a custom action that will perform basic validation as well as format the values into the necessary PowerShell commands.

Todo:

• French localizations are needed for the new strings in the fr-FR.wxl. I'll need to validate that the new strings don't overflow any UI elements once this is done.

Notes:

• The installer now displays the version number on the initial "Welcome" page
• The installer will now query the service startup type of an existing Devolutions Gateway service, and re-apply it after repairing or upgrading. This prevents a bug where that setting could be lost if a user customized it directly post-installation. The check is made in user-mode; in general local users are able to query service configurations but there are circumstances (e.g. remote install) where this might not work, so the result is unchecked and remains a best effort.
• To try and make things clearer, the .wxs now uses "namespaces" (as far as possible) for different IDs (P.* for properties, CA.* for custom actions, etc).
• The .wxs file(s) are also refactored to try and include common parts together. The existing "InitConfig" action is switched to use WiX quiet execution and prevent it popping a console window when it runs.
• The GitHub runners are switched to windows-2022 to allow using the v143 build tools (VS 2022). Note that msbuild is now required to be in your PATH to package Devolutions Gateway on Windows.

[CBenoit]

Nice! 💯