Graphical improvements

[tippesi]

• Reflections/SSGI/Volumetric clouds can now be rendered at full resolution to allow for better quality
• Upsampling from half resolution effects has been significantly improved
• General quality improvments to reflections/SSGI
• DDGI can now be used in a cascaded, scrollable way to allow for larger worlds with good GI
• Editor UI improvements
• Scripting support has been expanded (e.g. permanent script execution to allow for scripted scene editing)
• Significant CPU performance improvement
• Many bug fixes