## 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
* merc dma generation
* wip very early version of merc
* small fixes
* fix
* fix more merc bugs
* derp fixed min
* oops we did need something weird on max
* merc for everything
* program optimization 1
* more optimization
* windows
* windows 2
* clean up
* fix test
* BLERC
* update progress code and fix our frame "scissoring"
* aspect ratio hacks
* expand progress tint for widescreen
* give up and comment things properly
* properly undo hacks
* optimize sprite texture flush + update shaders
* fix bugs
* change logic a bit
* crunch PNGs
* hud size fix
* clang
* remove shaders from list
* use really small alpha cut-off point for sprites
* ad `flat` to vertex shaders too
* increase cut-off very slightly
* take *2 into account
* ok for real this should be good enough
* begin work
* work
* working objs
* exporting
* it works
* before some time of day fixes
* add time of day interp and also fix zbuffer
* some small blending fixes
* improve randomess
* clean up extraction and missing blend mode
* culling, time of day, more level fixes
* more cleanup
* cleanup memory usage
* windows fix
* wip, taking a break to work on asm stuff first
* the goal code for sparticle
* mips2c the first sparticle asm function
* temp
* particle processing no longer crashing
* temp
* working texture cache for vi1 and hud textures
* sprites
* cleanup 1
* temp
* temp
* add zstd library
* temp
* working
* tests
* include fix
* uncomment
* better decomp of sparticle stuff, part 1
* update references
Fabian Bergström