Allow manual selection of UTF-8 BOM encoding

[tfmorris]

We invented a private encoding, "UTF-8-BOM", to handle the wonky Microsoft format, but because it's not listed in the standard Java characters sets, it's not available in the manual selection dialog.

This means that a user can't select it by hand if they know it's the right format and it isn't guessed and it also means that if the format was guessed correctly, but they change it, they have no way to return to the original guess.

To Reproduce

Steps to reproduce the behavior:

1. Create a project and click on the encoding to bring out the encoding modal dialog

Current Results

The character encoding list doesn't include our private encoding.

Expected Behavior

The character set list includes "UTF-8 with BOM" with the code "UTF-8-BOM", preferably collated correctly in the list.

Screenshots

Versions

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