Remove references to the Glide API

Deletes hw_glide.h and removes the GrTexInfo struct. Also, renames all instances of gr_ to gl_ (except cvar names.)

added 86 commits

• 5c5d9072...bc2f83ec - 84 commits from branch next
• b9a24001 - Merge remote-tracking branch 'origin/next' into remove-glide-2
• 839f0862 - A few more instances of "gr" to purge

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merged

mentioned in commit 5bcc821a