Add more asserts for isOutsideTest
Add more asserts for isOutsideTest

This also tests other cases where the point happens to be on other edge cases for other sides of the triangle.

Contributes to issue CURA-1981.

totalretribution/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine,alephobjects/CuraEngine,Ultimaker/CuraEngine,totalretribution/CuraEngine,ROBO3D/CuraEngine,ROBO3D/CuraEngine,alephobjects/CuraEngine,alephobjects/CuraEngine,Ultimaker/CuraEngine