Support for running backtesting under MT5

[kenorb]

• Fixing scripts to support -e for MT5, so it can change Expert value in config file in the right place.
• Checking backtesting data (HCC), whether they're loaded automatically or we can provide our own.
• Check if platform is closed properly after backtest is finished.
• Parse backtest results and display on the screen (in verbose mode)
• Parse optimization results and display on the screen (in verbose mode)
• Convert backtest results into JSON format (as it's in MT4)