Automatic version discovery

[mastersign]

Provide a way to automatically discover the most recent version for an default app.
E.g. via an URL and a RegEx to extract the most recent version number.

[mastersign]

This mechnism needs a fallback strategy for using the last known working version.

[mastersign]

First steps in this direction is the PowerShell script auto\lib\Check-Apps.ps1.

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