simpify obj input args for tsview/plot_tran*/plot_coh*_mat*

[yunjunz]

Description of proposed changes

Simplify the input arguments for object initiation for tsview, plot_transection and plot_coherence_matrix:

• for each *Viewer object init(): replace cmd/iargs with inps, as the later covers both, and simpler.

• for each *Viewer configure(): rename to open() for simplicity

Reminders

• Fix tsview notebook example error missing required inps in v1.5.1 #977
• Pass Pre-commit check (green)
• Pass Codacy code review (green)
• Pass Circle CI test (green)
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