Fixed some bugs + After each cmd a query of all related parameters is done instead of only the most recent one

TRied to clean up a bit (not 100% finished): Changed the inheritance structure; everything inherits now from a Tektronix base class (which can be used for 3ks)

- Added readout cmd for Tek3000 osci
- Added Tektronix base class
- still needs some cleanup

Added class for MSO64 osci (working but needs more testing) and some files for TKDPO7k (not working / finished)

and Vis are writable now