use files in sketch folder to set the sketch's window icon

[benfry]

To address #5123 and #5202, we need an implementation that will handling custom icons to get around our issues with differences in surface between OpenGL and the default renderer.

This comment describes the approach we'll be using to fix it once and for all.

[codeanticode]

@benfry is this something you are planning to implement for the next release? Need any help?

[benfry]

Yeah, planning to. Didn't include it in the last release because I didn't want to mix feature changes with bug fixes. I'll have you take a crack at the OpenGL part once I have the API in place.

[codeanticode]

Ok, sounds good!

[cukiakimani]

@benfry Do we have an update on this?