Added two new features to ASSLReviewTemplateMatching GUI
1) A "Play File" button that allows you to play back the section of the
audio file that is being viewed currently through the computer's
speakers

2) A "High Res Spectrogram"/"Low Res Spectrogram" toggle button that
toggles between low and high resolution spectrograms for faster
performance with large data files. The resolution is changed by changing
the degree of overlap between successive fft windows from 0.95 to 0.5