message: Implement SQLiteDatabase::TxnBegin, TxnCommit, and TxnAbort
diff: @@ -431,17 +431,32 @@ void SQLiteBatch::CloseCursor()
  bool SQLiteBatch::TxnBegin()
  {
  - return false;
  + if (!m_database.m_db || sqlite3_get_autocommit(m_database.m_db) == 0) return false;
  + int res = sqlite3_exec(m_database.m_db, "BEGIN TRANSACTION", nullptr, nullptr, nullptr);
  + if (res != SQLITE_OK) {
  + LogPrintf("SQLiteBatch: Failed to begin the transaction\n");
  + }
  + return res == SQLITE_OK;
  }
  bool SQLiteBatch::TxnCommit()
  {
  - return false;
  + if (!m_database.m_db || sqlite3_get_autocommit(m_database.m_db) != 0) return false;
  + int res = sqlite3_exec(m_database.m_db, "COMMIT TRANSACTION", nullptr, nullptr, nullptr);
  + if (res != SQLITE_OK) {
  + LogPrintf("SQLiteBatch: Failed to commit the transaction\n");
  + }
  + return res == SQLITE_OK;
  }
  bool SQLiteBatch::TxnAbort()
  {
  - return false;
  + if (!m_database.m_db || sqlite3_get_autocommit(m_database.m_db) != 0) return false;
  + int res = sqlite3_exec(m_database.m_db, "ROLLBACK TRANSACTION", nullptr, nullptr, nullptr);
  + if (res != SQLITE_OK) {
  + LogPrintf("SQLiteBatch: Failed to abort the transaction\n");
  + }
  + return res == SQLITE_OK;
  }
  bool ExistsSQLiteDatabase(const fs::path& path)
  