* [wgpu-hal] Upgrade `glutin` to `0.31`
`glutin 0.30` onwards completely refactored its internals to no longer
be reliant on `winit`, as they (by default) have no direct relation
except needing to perform _some_ operations (platform-specific) at
strategic times in window creation and event loop handling. Most of
that is handled by a new `glutin-winit` introp crate, while the core
`glutin` crate now exclusively focuses on wrapping the various OpenGL
context APIs (CGL, EGL, WGL, ...).
This does result in a little more verbose handling to get the right
`GLDisplay`, `GLConfig`, `GLContext` and `GLSurface`, but gives much
more control and makes all intricacies more explicit. Most of the
code was copied from `glutin 0.31`'s example crate, with the code for
transparency support removed.
Note that the example doesn't at all handle event loop events properly:
resizes and redraws are not listened to, and mobile-specific surface
events (`Resumed` and `Suspended`) are equally ignored.
* [wgpu-hal] Implement proper `Surface` availability semantics in `raw-gles` example
The config can be made more precise so as to not accidentally
ignore some issues due to case (in-)sensitivity and searching for
substrings with `extend-words`.
Additionally, we can check the configuration directories as
well like `.github`.
The usage of `implace_it` went away some time ago, but not all
references were removed.
