Add try-catch-finally support: parse and generate opcodes for this construct

Fix varg generation: generate *_n opcodes with parameters in following meta opcodes
Add stack internal structure: dimanically allocated stack.
Use dynamically allocated memory in parser: every local and global variables are stored in dinamically allocated stacks.
Use dynamically allocated memory in serializer: opcodes are also stored in stack.
Change is_true_jmp and is_false_jmp opcodes to relative.
Change *jmp* opcodes to be able to store opcode_counter_t instead of idx_t.

tests/unit/test_try_catch.c

@@ -38,11 +38,11 @@ main( int __unused argc,
     [ 8] = getop_meta (OPCODE_META_TYPE_CATCH, 0, 14),
     [ 9] = getop_meta (OPCODE_META_TYPE_CATCH_EXCEPTION_IDENTIFIER, 2, 255),
     [10] = getop_equal_value_type (0, 1, 2),
-    [11] = getop_is_true_jmp (0, 14),
+    [11] = getop_is_true_jmp_down (0, 0, 3),
     [12] = getop_exitval (1),
     [13] = getop_assignment (0, OPCODE_ARG_TYPE_SIMPLE, ECMA_SIMPLE_VALUE_FALSE),
     [14] = getop_meta (OPCODE_META_TYPE_FINALLY, 0, 18),
-    [15] = getop_is_false_jmp (0, 17),
+    [15] = getop_is_false_jmp_down (0, 0, 2),
     [16] = getop_exitval (0),
     [17] = getop_exitval (1),
     [18] = getop_meta (OPCODE_META_TYPE_END_TRY_CATCH_FINALLY, 255, 255),