Support more than UTF-8/16 in word metadata import
The meta-data import code was only considering two possible codepages: UTF-8 and UTF-16. Word documents tend to use local encoding, so while this behaviour seemed flawless with US/UK documents, completely different encodings were broken. Instead of considering only UTF-8 and UTF-16, use QTextCodec and try to handle as many encoding as possible that way, warning if they are not found.
See https://bugs.kde.org/show_bug.cgi?id=406014 for example document
BUG: 406014