Released v1.8.0

Lots of changes this time, most important is the licensing: now the lib is licensed under LGPLv3.
- internal data structures are now hidden behind the accessor functions. (it was very convenient to be able to modify everything, including CPU contextes, but it's time to freeze the interface)
- libtool versioning system -> a more flexible solution (provided that the interface is frozen).
- smaller client-side code.
Full list in the changelog.