Remove globals from parser, use explicit structure.

c/jv_parse.h

@@ -0,0 +1,20 @@
+
+struct jv_parser {
+  jv* stack;
+  int stackpos;
+  int stacklen;
+  jv next;
+  int hasnext;
+  
+  char* tokenbuf;
+  int tokenpos;
+  int tokenlen;
+  
+  struct dtoa_context dtoa;
+
+  enum {
+    JV_PARSER_NORMAL,
+    JV_PARSER_STRING,
+    JV_PARSER_STRING_ESCAPE
+  } st;
+};