Updated and re-enabled the background animation on the main menu

game/engines/default/modules/boot/class/Game.lua

game/engines/default/modules/boot/class/Grid.lua

game/engines/default/modules/boot/class/NicerTiles.lua

game/engines/default/modules/boot/class/interface/Combat.lua

...engines/default/modules/boot/data/general/grids/basic.lua

...ngines/default/modules/boot/data/general/grids/forest.lua

...engines/default/modules/boot/data/general/grids/water.lua

...default/modules/boot/data/gfx/attacks/attack_white_01.png

...default/modules/boot/data/gfx/attacks/attack_white_02.png

...default/modules/boot/data/gfx/attacks/attack_white_03.png

...default/modules/boot/data/gfx/attacks/attack_white_04.png

...default/modules/boot/data/gfx/attacks/attack_white_05.png

...default/modules/boot/data/gfx/attacks/attack_white_06.png

...default/modules/boot/data/gfx/attacks/attack_white_07.png

...default/modules/boot/data/gfx/attacks/attack_white_08.png

...default/modules/boot/data/gfx/attacks/attack_white_09.png

...default/modules/boot/data/gfx/attacks/attack_white_10.png

...default/modules/boot/data/gfx/attacks/attack_white_11.png

...default/modules/boot/data/gfx/attacks/attack_white_12.png

...default/modules/boot/data/gfx/attacks/attack_white_13.png