Use priority queue for native string buffer

+1 2
-6 2

Performance

before

==== test finished, terminate logcat =====
(0)  100.34 (0.26%)
(1)  37149.26 (95.30%)
(2)  8.43 (0.02%)
(3)  11.18 (0.03%)
(4)  9.92 (0.03%)
(5)  1330.60 (3.41%)
(6)  250.46 (0.64%)
(20) 12.41 (0.03%)
Total 38982.50 (sum of others 38872.59)

after

==== test finished, terminate logcat =====
(0)  97.65 (0.26%)
(1)  35427.43 (95.32%)
(2)  10.30 (0.03%)
(3)  8.95 (0.02%)
(4)  11.01 (0.03%)
(5)  1224.67 (3.30%)
(6)  243.76 (0.66%)
(20) 40.91 (0.11%)
Total 37167.04 (sum of others 37064.68)

Change-Id: Id4d3b88a9cdef765affc52973aeac951ecc6a8ca
diff --git a/native/src/defines.h b/native/src/defines.h
index ef1beb9..b59f623 100644
--- a/native/src/defines.h
+++ b/native/src/defines.h
@@ -101,6 +101,7 @@
 #define DEBUG_PROXIMITY_INFO true
 #define DEBUG_CORRECTION false
 #define DEBUG_CORRECTION_FREQ true
+#define DEBUG_WORDS_PRIORITY_QUEUE true
 
 #define DUMP_WORD(word, length) do { dumpWord(word, length); } while(0)
 
@@ -125,6 +126,7 @@
 #define DEBUG_PROXIMITY_INFO false
 #define DEBUG_CORRECTION false
 #define DEBUG_CORRECTION_FREQ false
+#define DEBUG_WORDS_PRIORITY_QUEUE false
 
 #define DUMP_WORD(word, length)