merge with katjas: - added commands Qq, qBT, q0, q1 - minor fixes/improvements - doShader: if no bounding box is set, use the default user space
merge with katjas:
- added commands Qq, qBT, q0, q1
- minor fixes/improvements
- doShader: if no bounding box is set, use the default user space

yarick123/pdf-renderer