Fixes weird made-up word in glass sheet description.

Yeah, 're-paning' isn't a real word.
Added sound capability to the game.
Update melee.json

Added a definition for barbed wire baseball bats.
Update item_groups.json

Added barbed wire baseball bats to the survivor weapons group.
Update recipes.json

Added a recipe for barbed wire baseball bats.
Generate flags for SDL_mixer compilation and link.
Merge pull request #7209 from Rivet-the-Zombie/glass-fix

Fixes weird made-up word in glass sheet description.
Merge pull request #7217 from Hiroga/barbedwire-bat

Adds barbed wire baseball bats