Ensure vector3df and all classes containing a vector3df are passed by reference instead of per value. Thanks @Danyal Zia for the patch (#280).
This is breaking the IAttributes interface - so anyone who derived from that will have to update his implementation. More changes in that interface probably coming later today.
The idea behind the patch is preparing the engine for SSE support.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4725 dfc29bdd-3216-0410-991c-e03cc46cb475
Change the rest of the attributes interfaces to pass parameters by const ref instead of per value.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4726 dfc29bdd-3216-0410-991c-e03cc46cb475
- Collada dae-loader now set's the vertex colors (thx @sf17k for report and test-models)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4727 dfc29bdd-3216-0410-991c-e03cc46cb475