Recommendation is to avoid using the year nomenclature as this
information is already encoded in the git repo. Avoids needing to
repeatly update.
Also updates AUTHORS.txt from current repo with contributor names
Moves the logic into the SCH_RENDER_SETTINGS, rather than
repeating it in EESCHEMA/SYMBOL_EDITOR_SETTINGS (they still
maintain their state there, but the painter looks at the
SCH_RENDER_SETTINGS).
Also turn them off for preview purposes.
