CDDTCast does not always honor max range

[droemer7]

When using CDDTCast, the max_range parameter is not always honored. The behavior seems to be limited to two scenarios.

Let's say max_range is set to 30.0:

1. An obstacle lies along the ray being cast at a true range of 50.0. CDDTCast::calc_range() will return 50.0 (incorrect, 30.0 expected).
2. No obstacle lies along the ray being cast (the map is open). CDDTCast::calc_range() will return 30.0 (correct).

It's not immediately obvious where the bug itself is because the algorithm is so complex and has lots of return statements. I'm not sure what a proper fix is but a workaround would be to clamp the max range returned by CDDTCast::calc_range().

The other raycasting methods Bresenham (BL), Ray Marching (RM), and Giant Lookup Table (GLT) are not affected.