remove unused files

recreate mask_artist if self.img changed

resize self.img to FFT_SIZE x FFT_SIZE

add remove method, fix visible bug

remove old freedraw_widget

refactored magics

add row_label argument

remove get_matrix()

add plot_data_as_colormesh

call clear_output

fix sympy_latex mlab_plot , add cut

add marker

change c to x

add section and marker

change line end