Determine the angles (between three known points) as seen by an observer with a known position.

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`A` |
A point defined by a vector containing an x- and an y-coordinate |

`B` |
A point defined by a vector containing an x- and an y-coordinate |

`C` |
A point defined by a vector containing an x- and an y-coordinate |

`observer_position` |
A vector containing an x- and an y-coordinate |

`output_plot` |
Boolean variable indicating whether a plot should be created |

`lines_in_plot` |
Boolean variable indicating whether lines should be drawn in the plot |

`angles_in_plot` |
Boolean variable indicating whether the angles should be printet in the plot |

`decimals_in_plot` |
Integer indicating the number of decimals used |

The angles as seen by the observer expressed in radians.

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