Revert "decode utf8 strings in Options, to address #1710"

This reverts commit d232792a897a0f948a76abf94c2a2aae09d6c581.
Revert "Parse text for scale factor in Plater.pm to support non-integer scale values and address issue #1617"

This reverts commit 60014aadc82fe102fecc931a9bad5dbc5993e308.