Remove UTF-8 BOM from text files

[xtqqczze]

PR Summary

• Remove UTF-8 BOM from text files.
• Specify utf-8 charset in .editorconfig to prevent IDEs inserting BOM.

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.

[bergmeister]

@xtqqczze Sorry for the late review. Can you please elaborate why you need this change or why it would be beneficial to this repo?

[rjmholt]

Remove UTF-8 BOM from text files.

My main concern is with this part; Windows PowerShell isn't going to like BOM-less UTF-8

[rjmholt]

Instead, ps*1 files should probably have a BOM and other text files should not

[rjmholt]

The configuration should match that, but generally looks good to me

[rjmholt]

Please change ps*1 files to UTF-8 with BOM, adapt the editor config to reflect that and regenerate the resource file to resolve the conflict

[rjmholt]

@xtqqczze after looking through your approach in this PR and thinking about some of the particulars of this repo, I've opened #1665, which goes a bit further and tries to clean up some of the strangeness in the PSSA repo.

In particular, it specifies more settings, uses UTF-8 with BOM for PowerShell files, and makes sure test assets (some of which are deliberately encoded or formatted differently) are put in a protected assets directory

[xtqqczze]

@rjmholt I will close once #1665 is merged.