change the way of getting index of data picked to be more accurate on upDownDots and return real_idx instead of list_idx and section_idx; return old code for plotting widget which including getting plotting_data2 for mass_position;

move picker from scatter to plot in plot_lines_mass_pos() so checking for line2D in plotting_widget's on_pick_event works for masspos

move unittest for get_total_miny_maxy from tests/view/test_function.py to tests/view/plotting/plotting_widget/plotting_widget_helper.py

move function that serve plotting_widget from view/util/functions.py to view/plotting/plotting_widget/plotting_widget_helper.py; implement get_data_point_info() to build data point's info in a simpler way and works for both mass position and normal channels

Clean up no-need files/ folders and refactoring directory structure

See merge request !158

Fix bug not plotting mass position on main window when preference list is selected

Closes #129

See merge request !153

Fix bug in reftek not plot channel with question mark '?' if use preference list

Closes #128

See merge request !154

Fix bug that acquires attribute chan on ax on the non plotting area

Closes #119

See merge request !156

reset zoom_marker1_shown when replotting

Closes #130

See merge request !157

Convert pyside6

See merge request !155

allow to select multi folder to load

Closes #74

See merge request !122

fix zooming, order, y for the combination of 2 channels GPS_lk_Unlk and GPS_clock_power

Closes #131 and #127

See merge request !148

Channel Preferences Dialog: scan data source give info according to key, add data time

Closes #98

See merge request !124

intergrate rt130

See merge request !152

fix bug on ctrl/cmd click on waveform

Closes #122

See merge request !146

Fix bug happen when zooming in overlap section

See merge request !149

when zooming, set_axes_ylim only perform when total_points > 1 to prevent the...

Closes #125

See merge request !150

handle plot line when there is only one point

Closes #126

See merge request !151

Change the way RT130 data is read for better performance

See merge request !139

Remove noneed plotting code

See merge request !147