Line.raycast() / raycast() internal rewrite

[novialriptide]

Right now, we are still internally naming a ray as a line in the C code, which I do not think is appropriate.

I propose renaming and reorganizing some C functions to take in double types instead of a pgLineObject for the following functions:

pgIntersection_LineCircle();
pgIntersection_LineLine();
pgIntersection_LineRect();