Parse attributes in the input box
libsexy: fix spell-check on contractions
libsexy: load colors more efficiently
Fix loading enchant on Unix
Remove gtkspell support
Update to gtkspell3's iso code lookup

This no longer requires libxml
so now there is no reason for this to be optional
libsexy: Don't mark nicks spelled incorrect
Use spell entry for topicbar

Closes #150
More improvements to libsexy

- Add option for showing attributes in input
- Improve attribute parsing
- Fix detecting iso-codes on unix
- Improve getting default langs from $LANG
- Fix warnings