added igt and play audio by text

for OpenSourceFieldlinguistics/FieldDB#1455
and
for OpenSourceFieldlinguistics/FieldDB#485
to automate
OpenSourceFieldlinguistics/FieldDB#544
and praat import
for OpenSourceFieldlinguistics/FieldDB#1260
added more support for finding speakers in the tiers

for better support for dialog detection for
    OpenSourceFieldlinguistics/FieldDB#544