Support EBCDIC encodings

[ind1go]

There are no EBCDIC encodings available in the encoding chooser when opening a file, making it impossible to read files in EBCDIC encodings like cp37 and cp1047.

🙋‍♂️ I'll happily take a look at this if someone can point me in the right direction to get started!

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• VSCode Version: 1.23.0
• OS Version: MacOS

Steps to Reproduce:

1. Open a file which is in an EBCDIC encoding
2. ⌘+⇧+P to open the command palettle
3. Change File Encoding -> Reopen with Encoding
4. Weep when no EBCDIC options are displayed in the list 😢

Does this issue occur when all extensions are disabled?: Yes

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Allow to associate a file encoding per file path (#23570)
• autoGuessEncoding improvements (#30857)
• Wrongly guess encoding as Windows 1252 or ISO-8859-2 (#27419)
• "Stage selected ranges" command changes encoding to UTF-8 (without regarding to the initial file encoding) (#36219)
• Allow to get/set the encoding and charset (#4958)

[bpasero]

Depends on ashtuchkin/iconv-lite#111

[vscodebot]

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