Blob Intersection Test

Uses Ryan Alexander's line-line intersection test to check if a point is inside or outside an irregular blob (The point being the mouse). Checks a ray from the right of the point, if it hits an even number of edges of the blob, it's outside (odd means it's inside). Plus some other rules for when the ray is only intersecting a point on the blob, and not a line segment of it. As always, there's probably a better way of doing this, I'm no expert, but this works. I've tried it with blobs in OpenCV blob detection and it works, some fun possibilities there perhaps.