Auto-detect file encoding for files opened in the Web IDE

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Problem to solve

Opening files that use characters that aren't included in the character set available in the default encoding results in inaccurate rendering of content. VS Code already has a setting to auto-detect file encoding.

Proposal

files.autoGuessEncoding is the settings value we should look at first.

1. Investigate the accuracy of the built-in auto-detect feature
2. Assuming the accuracy is good enough, enable this feature by default in the Web IDE
3. If the accuracy is not acceptable, we can investigate other ways to detect the encoding and provide a custom alternative.