Replace testimonials_widget_ of actions, filters, and functions with tw_

[michael-cannon]

Basically, replace testimonials_widget_ with tw_

[michael-cannon]

find . -type f \( -name "*.php" -o -name "*.txt" -o -name "*.md" \) -exec perl -pi -e "s#testimonials_widget_#tw_#g" {} \;
find . -type f \( -name "*.php" -o -name "*.txt" -o -name "*.md" \) -exec perl -pi -e "s#tba_#tw_#g" {} \;