Opera 10.54

# Security

* Fixes
- Prevented Opera from being used as a vector for a font issue in the underlying operating system, as reported by Microsoft's security team; see our advisory (http://www.opera.com/support/search/view/954/).
- Fixed an extremely severe issue; details will be disclosed at a later date.
- Fixed a highly severe issue; details will be disclosed at a later date.
- Fixed a moderately severe issue; details will be disclosed at a later date.
- Fixed a less severe issue details will be disclosed at a later date.