Added m8 variant

This is a Variant I created called male8, probably one of the smoothest sounding espeak male variants ever. It sounds very good with inflection at 100, which I don't know if you can only change in NVDA or other programs too.

espeak-ng-data/voices/!v/m8

+language variant
+name male8
+gender male 50
+
+pitch 65 102
+formant 0 100 125 100
+formant 1 96 90 80
+formant 2 97 70 90
+formant 3 97 60 90
+formant 4 97 60 90
+formant 5  75 50 90
+formant 6  90 50 100
+formant 7 100 50 100
+formant 8 100 50 100
+
+tone 100 255 600 70 1200 22 2000 66 3000 12