* get rid of vertex buffers in example
* get rid of unused attributes in example shader
* use negative viewport height to match wgpu
* remove depth buffer
* use SRGB surface
* improve tonemapping
remove 'gamma correction' in favor of hardware srgb support
* make clippy happy
* move tonemapping out of sky(), rename gl_pos to builtin_pos
* rename shaders and use sky shader in wgpu example runner
* apply srgb OETF and invert clip space for cpu example runner
* restructure example directory structure according to #170
* update winit in wgpu example runner
* fix deny.toml example crate refs
* fix ci example name on maOS
* example-shader -> sky-shader in docs
* update sky shader image
* re-enable clippy and make it happy
