Support eSpeak

[willwade]

I've fixed eSpeak in this PR thevickypedia/py3-tts#6

ie this https://github.com/willwade/py3-tts

we can link to my repo for now

to do it I really should rework sapi and espeak (both using py3-tts) in tts-wrapper which would make more sense first

[willwade]

NB syntax is - wierd (?) for espeak and SAPI #53

from tts_wrapper import SAPIClient, SAPITTS
client = SAPIClient('espeak') # eSpeak
# Initialize the TTS engine
tts = SAPITTS(client)