replace std::list with std::vector on some hot paths

also use reserve where appropriate

tests/core_tests/double_spend.cpp

@@ -73,7 +73,7 @@ bool gen_double_spend_in_different_chains::check_double_spend(cryptonote::core&
 {
   DEFINE_TESTS_ERROR_CONTEXT("gen_double_spend_in_different_chains::check_double_spend");
 
-  std::list<block> block_list;
+  std::vector<block> block_list;
   bool r = c.get_blocks(0, 100 + 2 * CRYPTONOTE_MINED_MONEY_UNLOCK_WINDOW, block_list);
   CHECK_TEST_CONDITION(r);