This is so I can get rid of wgpu from the launcher, where it's only
purpose is to figure out the GPU name for the support package.
The problem with it is that on some environments, it errors, but the
function cannot have it's errors gracefully handled (it panics and
crashes instead).
So I'm tired of it, do it ourselves.
## Problem
OpenGOAL uses OpenGL 4.3.
Apple stopped upgrading OpenGL after 4.1, so the way OpenGOAL currently
works will never be playable on Macs using OpenGL.
## Solution
Luckily, downgrading to OpenGL 4.1 is not a huge change (at least it
doesn't seem like it to my untrained eyes).
## Changes
* set hints for OpenGL 4.1 instead of 4.3 for __APPLE__
* skip the OpenGL debugging callback setup for macOS (requires 4.3)
* bump down the version string for all shaders
* stop using the `binding` layout qualifier in shader code
* move the `flat` qualifier first (not sure if this is a 4.1 thing or
just Macs being more strict)
* don't mix signed and unsigned ints in shaders (not sure if this is a
4.1 thing or just Macs being more strict)
* add some hacky CPP to the Shader constructor for binding texture units
and bones buffers based on variable names in the shader code
## Results
