Lots of new stuff

- [x] Merged in new Brief theme
- [x] Full tested support for Skype 6
- [ ] Backwards compatible versions for Skype 5
- [x] Taken out the gifman js so it's in it's own file, not modified the Brief theme at all.
- [x] Checkbox to turn on / off embeds globally.
- [ ] Automatically decode base64 text
- [x] Fix for unsupported links