Simplify serializer/deserializer. Reduce memory usage in lexer. Create HashTable data structure. Finish preparations for introducing new strings addressation.

tests/unit/test_assignment_opcode.c

@@ -18,6 +18,7 @@
 #include "mem-allocator.h"
 #include "opcodes.h"
 #include "serializer.h"
+#include "common.h"
 
 /**
  * Unit test's main function.
@@ -42,12 +43,12 @@ main( int __unused argc,
   };
 
   mem_init();
+  serializer_init (false);
 
-  const char *strings[] = { "a",
-                            "b" };
+  const lp_string strings[] = { LP("a"), 
+                                LP("b") };
   ecma_number_t nums [] = { 2.0 };
-  uint16_t offset = serializer_dump_strings( strings, 2);
-  serializer_dump_nums( nums, 1, offset, 2);
+  serializer_dump_strings_and_nums (strings, 2, nums, 1);
 
   init_int( test_program, false);