Fix compiling on MacOS X by requiring c++11 standard. Building now requires MacOS X 10.8+ and CMake 3.9+
sky = 19, 18, 82
border = 176, 51, 0
music = Nature.ogg
clouds = 9
object = plant1, 3, 65, 258, 80, 2, 1, 0, 0, 240, 215
object = plant2, 3, 21, 163, 33, 15, 1, 60, 62, 87, 95
object = plant3, 3, 40, 0, 25, 1, 1, 0, 35, 100, 65
object = plant4, 3, 98, 10, 2, 25, 1, 0, 0, 70, 110
object = mole, 1, 0, 129, 161, 71, 1, 13, 0, 142, 99
object = mole2, 1, 0, 129, 161, 71, 1, 13, 0, 142, 99
object = mole3, 1, 0, 129, 161, 71, 1, 13, 0, 142, 99
object = butterfly, 1, 43, 176, 56, 6, 1, 21, 14, 91, 46
object = snail, 3, 51, 94, 52, 3, 1, 0, 0, 135, 87
object = mushroom, 3, 14, 77, 24, 2, 1, 0, 0, 76, 73
object = mushroom2, 3, 24, 78, 48, 7, 2, 0, 0, 80, 36, 15, 38, 57, 30
flakes = 55, 40, 0, 30, 200