Change Polygon2d directory and add it to gd namespace

[4ian]

Change Polygon2d directory and add it to gd namespace

[4ian]

For now, most files uses Polygon by refering to GDCpp/Polygon.h (which is nice, but as the class is named Polygon2d, it should be renamed to GDCpp/Polygon2d.h).
No classes in GDCore/PlatformDefinition are using Polygon so I'm not sure it should not be in this directory..

[victorlevasseur]

You've forgotten to change the include in the GDCpp/Polygon2d.cpp file. ;)
(Don't do anything, I've fixed it in a bugfix pull-request for the tilemap object)

[4ian]

Oops, good catch ;)