add app_dictate (bug #3893)

Makefile

apps/Makefile

apps/app_dictate.c

sounds.txt

sounds/dictate/both_help.gsm

sounds/dictate/enter_filename.gsm

sounds/dictate/forhelp.gsm

sounds/dictate/pause.gsm

sounds/dictate/paused.gsm

sounds/dictate/play_help.gsm

sounds/dictate/playback.gsm

sounds/dictate/playback_mode.gsm

sounds/dictate/record.gsm

sounds/dictate/record_help.gsm

sounds/dictate/record_mode.gsm

sounds/dictate/truncating_audio.gsm