BeeBot.py has repetitive code for handling sprite rotation. Consider refactoring.

See lines [47](https://github.com/stfc/SciBot/blob/develop/src/BeeBot.py#L47), [73](https://github.com/stfc/SciBot/blob/develop/src/BeeBot.py#L73) and [230](https://github.com/stfc/SciBot/blob/develop/src/BeeBot.py#L230).

Could be tackled at the same time as #49 