v0.0.7

• add a vigniettes about ethical research and introduction to work with phonfieldwork
• add an argument textgrids_from_folder to the textgrid_to_df() function
• add an argument exbs_from_folder to the exb_to_df() function
• add an argument eafs_from_folder to the eaf_to_df() function
• add Raven style annotations
• replace freqmax with frequency_range argument
• replace example_textgrid with systemfile() call
• add window annotation to spectrograms
• add bridge to lingtypology package: map argument in the create_viewer() function
• make it possible to visualise all types of annotations with the draw_sound() function
• add the source column to all ..._to_df() functions
• add the audacity_to_df function
• add the srt_to_df function
• chage textgrid related functions' output from start, end, annotation to time_start, time_end, content
• correct point tier visualization