v0.7.0 - Prices in USD, order edition and more

This substantial release adds long-await features requested by users.

After pulling this update, please run poetry install --no-dev to upgrade all dependencies!

• A new setting price_in_usd allows to display, input and track prices in USD/token instead of BNB/token
  • All existing order prices will be automatically updated when the bot is restarted after changing this parameter (using current BNB price)
  • Orders are still buying using BNB, and selling for BNB. Customization of this behavior will come in a later update.
• Orders can now be edited with the /editorder command. Price, trailing stop loss callback, amount, gas and slippage can be edited for an existing order.
• Codebase has been cleaned up and pre-commit hooks are now available to format code before allowing a commit. Install using pre-commit install after upgrading the dependencies if you wish to contribute to this repository.