Create draft files using the target project's encoding

[mmartin9684-sil]

When drafts are created using silnlp experiment/translate scripts, they use either utf-8, utf-8-sig, or the source project's Encoding setting. However, if the draft is being created so that it can be added to a target project with a different Encoding, the draft needs to be saved with the encoding used by the target project. For instance, if the target project uses an encoding of "cp1250" or "cp1252", a draft saved with "utf-8"/"utf-8-sig" encoding may not import correctly into the Paratext project.

For instance, the MAO project is configured in Paratext to use "1250" (Central European) encoding. When a draft is created with "utf-8" encoding using silnlp, the Latin Extended and Latin Extended A characters are not correctly displayed in Paratext. If the text is corrected so that it uses one of these characters, the text is not saved correctly after editing.