A line object must have at least two points to plot a line through. At
any vertex count less than that, we were accessing invalid memory by
dereferencing the first element of an empty vector (VtxNum==1), or
issuing an OOB read from the vertex data (VtxNum==0).
Renamed CreateObject() to CreateObjectAbove() and replaced all occurrences in script files.
Added CreateObject(), the function may need a rewrite though, see comment in code.
Updated documentation