Base64 decode support

Features
#1

I am hoping to scan a QR code with the barcode scanner that is encoded via base64. I thought I found an XPath function base64Decode that might work, but I think that's possibly only available as an extension.

Short of creating a separate Android app to provide the scanning and decoding via an intent, are there other workaround that might allow for base64-decoding a value in ODK?

Proposal: add `centroid` and `base64Binary-to-string` functions
#2

The function doesn't exist, but it's something we can add to the next release (rough ETA end of March) if it'd be helpful.

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#3

The base64-decode function is available in the latest 2023.1 beta and should be released on Monday.

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