Patch notes

Changes to the standard colour scheme. It now has a background image plus some transparency has been removed. - Panels added around the game setup screen and the settings option from the main menu, to offset previous use of transparency to derive background colour on these screens. - Changed the way cell count field shown so it doesn't just blend into dark backgrounds (e.g. on the Night colour scheme). - Added a new "Transparent" colour scheme option which is similar to the old standard colour scheme. - Fix to the "Next" button on the "Codeword" screen, it would disappear on smaller screen sizes (e.g. when running in a window). - Fix the size of the player name in the "Battle Board" setup screen. It was no longer linked to the interface scale setting. - Fix to a bug with table image loading where data was checked using the wrong indexing values. - Fix a saving issue in the voxel designer. - WIP. Specific spherical skyboxes for some specific boards/shapes (e.g. added an "asteroid field" for the imperial star "Destroyer" shape and the "Tardi3d" board). Note that it's currently linked to the "extra textures" setting being ticked, and that no such feature has currently hasn't been added to the "Word Hunt" game, nor to other non-board/shape related games. - Fix to mapping issue with falcon "Freighter" board, 4 adjacent cell pairs only linked in one direction.