picked some changes from posh branch to make timeliner work:

* ICommandHistory has IntertOnly method
* IIDItem has more extention methods
Merge commit 'd14f2f094b98aa9450b144f7e38419cedac7371a' into develop
automatically reject empty compound commands
updated svg lib
adapted svg to latest lib
added PID (VVVV)
finished removal of Undistort. see also a71a684055676ae46ae4b8852a612952b902476f