Update kokoro.py

Adds support for longer texts by multiple pass through the model. Generation example using `'af_nicole'` - [here](https://aeryskyb.github.io/weird_corner/urgesurfing/)!

kokoro.py

@@ -1,6 +1,7 @@
 import phonemizer
 import re
 import torch
+import numpy as np
 
 def split_num(num):
     num = num.group()
@@ -147,3 +148,18 @@ def generate(model, text, voicepack, lang='a', speed=1, ps=None):
     out = forward(model, tokens, ref_s, speed)
     ps = ''.join(next(k for k, v in VOCAB.items() if i == v) for i in tokens)
     return out, ps
+
+def generate_full(model, text, voicepack, lang='a', speed=1, ps=None):
+    ps = ps or phonemize(text, lang)
+    tokens = tokenize(ps)
+    if not tokens:
+        return None
+    outs = []
+    loop_count = len(tokens)//510 + (1 if len(tokens) % 510 != 0 else 0)
+    for i in range(loop_count):
+        ref_s = voicepack[len(tokens[i*510:(i+1)*510])]
+        out = forward(model, tokens[i*510:(i+1)*510], ref_s, speed)
+        outs.append(out)
+    outs = np.concatenate(outs)
+    ps = ''.join(next(k for k, v in VOCAB.items() if i == v) for i in tokens)
+    return outs, ps