Reflections update (v8 / demo v15)

​Just one thing added for this update but it's fairly big: [h3]Planar reflections[/h3] [list] [*]These are more accurate reflections for windows, mirrors and glass doors. [*]Can be turned on or off at "Options/Graphics/Planar reflections". [*]There is also a "min. size" setting that determines the minimum on-screen size of the surface for the reflections to be visible. [*]Those who enable planar reflections can reduce the "Env. map resolution" setting to substantially reduce video memory usage with minimal visual impact. [/list]