simplyfied CircularBuffer and added LineBuffer testcase
do not upload statusbar for no reason (might solve flicker issues?)
- added VectorLineBuffer
- add ILineBuffer interface to allow swapping in a VectorLineBuffer instead of the CircularBuffer
this in turn enables the CircularBuffer and all enabling infrastructure to be tested separately.
- fixed DbgMsgSrc -s option
Circular buffer still experimental, so disabled in release code