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

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.

Render wave of add_sin() with phase starting at start of wave, i.e. independent of start time of pulse