Add more clipping methods

[juliohm]

• Weiler-Atherton: https://dl.acm.org/doi/pdf/10.1145/563858.563896
• Greiner-Hormann: https://dl.acm.org/doi/pdf/10.1145/274363.274364
• Vatti: https://dl.acm.org/doi/pdf/10.1145/129902.129906
• Martínez: https://www.sciencedirect.com/science/article/abs/pii/S0098300408002793