Replace p_context_init() with p_context_new()/p_context_delete()

spec/test_tree_field_aliases.c

@@ -6,16 +6,17 @@
 int main()
 {
     char const * input = "\na\nb\nc";
-    p_context_t context;
-    p_context_init(&context, (uint8_t const *)input, strlen(input));
-    assert(p_parse(&context) == P_SUCCESS);
-    Start * start = p_result(&context);
+    p_context_t * context;
+    context = p_context_new((uint8_t const *)input, strlen(input));
+    assert(p_parse(context) == P_SUCCESS);
+    Start * start = p_result(context);
 
     assert_eq(TOKEN_a, start->first->pToken->token);
     assert_eq(TOKEN_b, start->second->pToken->token);
     assert_eq(TOKEN_c, start->third->pToken->token);
 
     p_free_tree(start);
+    p_context_delete(context);
 
     return 0;
 }