Add support for Brilliant Diamond / Shining Pearl

[mirekdlugosz]

Preliminary support for BDSP is added in brilliant-diamond-shining-pearl branch. However, we can't merge and deploy it because:

• Pokemon Showdown is missing data on some Pokemon (current count says 158, but that includes 18 formes of Arceus, 4 Deoxys etc.)
• "I have Pokémon transferred from earlier game" should be conditionally hidden in UI when BDSP is selected

We probably need to gradually add missing Pokemon data into Showdown and only then deploy.

List of missing Pokemon:

['aipom', 'ambipom', 'ampharos', 'arceus', 'arceusbug', 'arceusdark', 'arceusdragon', 'arceuselectric', 'arceusfighting', 'arceusfire', 'arceusflying', 'arceusghost', 'arceusgrass', 'arceusground', 'arceusice', 'arceuspoison', 'arceuspsychic', 'arceusrock', 'arceussteel', 'arceuswater', 'ariados', 'banette', 'bastiodon', 'bayleef', 'beautifly', 'bibarel', 'bidoof', 'breloom', 'buizel', 'burmy', 'cacnea', 'cacturne', 'camerupt', 'carnivine', 'cascoon', 'castform', 'chatot', 'chikorita', 'chimchar', 'chimecho', 'chingling', 'clamperl', 'cranidos', 'croconaw', 'cyndaquil', 'darkrai', 'delcatty', 'deoxys', 'deoxysattack', 'deoxysdefense', 'deoxysspeed', 'donphan', 'dustox', 'empoleon', 'feraligatr', 'finneon', 'flaaffy', 'floatzel', 'forretress', 'furret', 'girafarig', 'glameow', 'gligar', 'gliscor', 'gorebyss', 'granbull', 'grotle', 'grumpig', 'gulpin', 'hariyama', 'honchkrow', 'hoppip', 'houndoom', 'houndour', 'huntail', 'illumise', 'infernape', 'jumpluff', 'kecleon', 'kricketot', 'kricketune', 'ledian', 'ledyba', 'lumineon', 'luvdisc', 'magcargo', 'makuhita', 'manaphy', 'mareep', 'masquerain', 'medicham', 'meditite', 'meganium', 'mightyena', 'minun', 'misdreavus', 'mismagius', 'monferno', 'mothim', 'murkrow', 'nosepass', 'numel', 'pachirisu', 'phanpy', 'phione', 'pineco', 'piplup', 'plusle', 'poochyena', 'prinplup', 'probopass', 'purugly', 'quilava', 'rampardos', 'sentret', 'seviper', 'shaymin', 'shayminsky', 'shieldon', 'shroomish', 'shuppet', 'silcoon', 'skiploom', 'skitty', 'slaking', 'slakoth', 'slugma', 'snubbull', 'spinarak', 'spinda', 'spoink', 'stantler', 'staraptor', 'staravia', 'starly', 'sunflora', 'sunkern', 'surskit', 'swalot', 'swellow', 'taillow', 'teddiursa', 'torterra', 'totodile', 'tropius', 'turtwig', 'typhlosion', 'unown', 'ursaring', 'vigoroth', 'volbeat', 'wormadam', 'wormadamsandy', 'wormadamtrash', 'wurmple', 'yanma', 'yanmega', 'zangoose']