Source code text conventions with EditorConfig settings

[bignose-debian]

With many contributors, this project would IMO benefit if this code base declares an EditorConfig settings file, and conforms to basic conventions in text files.

• Text encoding (UTF-8 only).
• Line ending (U+000A LF only).
• Indent style (spaces only).
• Indent size (4 columns).
• No trailing white space (to avoid pointless diff noise).
• etc.

With an appropriate EditorConfig settings file, contributors can just turn on EditorConfig in their preferred text editor to get all the right settings for this code base.

[bignose-debian]

I have a proposed implementation, that cleans up the code base (as of current ‘master’) to conform with some standard settings, then adds the EditorConfig settings file to enforce them.