Added signalling bits for enabling/disabling pitch, short blocks, and folding.
Also, making it possible to disable pitch for all frames.
diff --git a/libcelt/modes.c b/libcelt/modes.c
index 7d60016..be7248d 100644
--- a/libcelt/modes.c
+++ b/libcelt/modes.c
@@ -425,6 +425,7 @@
 #endif
 #endif
    mdct_clear(&mode->mdct);
+   mdct_clear(&mode->shortMdct);
    pitch_state_free(mode->fft);
    quant_prob_free(mode->prob);
    celt_free((celt_int16_t *)mode->energy_alloc);