Tradeo

- feat:
- New Blocker class to lock the executions
- Order object has a new __str__() method
- refactor:
- Several methods are moved from one module to another
- fix:
- $USER environment variable updated to $HOME variable
- We retrieve the environment variables from MetaTrader
- Bug about remaining symbols fixed
- Bug about command files fixed

- fix:
- New structure of folders to solve files issues.

- feat:
- New attribute PNL in Order object
- New attribute **kwargs in Strategy static methods
- fix:
- "TB_STRATEGIES" and "TB_EVENT_HANDLER_CLASS" variables removed

- refactor:
- The necessary changes are made to prepare for the first tag

- feat:
- Factory classes removed

- feat:
- Executable class for custom your own bots