Graalv6.037: OpenGL fullscreen

[Admins]

A new version for Windows has been released: v6.037
- OpenGL is now the default graphic mode because it's faster than the DirectX mode in Graal
- In OpenGL you can now play in fullscreen!
- Fixes a smaller problem with Graal losing the focus when you close PMs
- For drawing panels you can now define enablecache = false to disable refresh of the drawing panel (or icon) if the image has been changed, which is good if you draw a lot or generate maps
- drawObject() in drawing panels is now correctly registered so that you can clearall() after it