[Uml-devel] Include cleaning

[Jonathan Riddell]

> Here is some #include cleaning.

Couple of things to query before this gets committed

there's a number of
#include <qdatastream.h>
lines which have been removed from classes which do use the QDataStream
class

Also noticed #include <maths.h>
being removed from linepath which causes problems (of course it should be
<cmaths> anyway).

Many thanks

Jonathan Riddell