Bazooka/Grenade Training: Make weapon selection detection future-proof
The old check relied on hardcoded slot IDs for the weapons, which is not good.
sky = 116, 239, 255
border = 242, 230, 124
water-top = $3E, $7B, $94
water-bottom = $35, $69, $85
water-opacity = $80
sd-water-top = $47, $24, $3e
sd-water-bottom = $42, $1F, $39
sd-water-opactiy = $80
music = Desert.ogg
clouds = 9
object = sand, 4, 9, 3, 4, 4, 2, 1, 1, 7, 27, 9, 31, 5, 6
object = sandR, 4, 4, 3, 4, 4, 2, 9, 1, 7, 27, 3, 31, 5, 6
object = buzzard, 1, 17, 318, 4, 21, 1, 51, 91, 289, 241
object = cobra, 1, 65, 230, 57, 4, 1, 28, 0, 206, 202
object = cactus, 3, 27, 440, 73, 10, 1, 0, 0, 258, 384
object = rock1, 2, 75, 108, 73, 12, 1, 0, 0, 173, 99
object = rock2, 5, 7, 18, 10, 1, 1, 0, 0, 24, 12
spray = cowskull, 2
sd-tint = $e7, $68, $68, $ff