[1/3] winemenubuilder: use windowscodecs for some ICO to PNG conversion

[Damjan Jovanovic]

Changelog:
* winemenubuilder: use windowscodecs for some ICO to PNG conversion

This patch series is based on deferred patches from during the code freeze.

Using windowscodecs simplifies the code and fixes some icon transparency issues.

Damjan Jovanovic
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