3.0
* wrap everything into a library namespace (?)
* add API to allow mixing client side
* hide virtual functions in sidbuilder class


someday/maybe:

* do not require call to sidbuilder::create
* support non-ascii paths on Windows (SidTune, STIL)
* relocate only psid tunes (?)
* add SIDid support
* implement support for mus data embedded in psid files
* test hardsid support
