Removed add_HVI_marker and add_HVI_variable from segment channels. Huge performance improvement for GST and RB. O(N^2) -> O(N)

Added aggregate_func to aggregate n samples of 1 measurement to a single value with a user defined function.

* added lazy reset time
* store segment end time
* removed unused code

Fixed attenuation qubit channel for Qblox

Added argument reload_seq=True to use 1D and 2D fast scan with external sweep modifying pulse-lib settings.