Feature request: Download games from advanced search

[jamesqo]

It would be very convenient if there was a way to download the output of Advanced Search queries into a PGN file. Seems like this would be a relatively easy and sensible feature to implement.

[ErdoganSeref]

We can add an a tag beside the permalink.

lila/app/views/search/index.scala

Lines 80 to 85 in 379e101

	frag(
	div(cls := "search__status box__pad")(
	strong(xGamesFound(pager.nbResults.localize, pager.nbResults)),
	" • ",
	permalink
	),

We can use the API to provide the href.

lila/conf/routes

Lines 21 to 24 in 379e101

	# Game export
	POST /games/export/_ids controllers.Game.exportByIds
	POST /api/games/export/_ids controllers.Game.exportByIds
	GET /games/export/:username controllers.Game.exportByUser(username)

But how can you pass exportByIds a list of game IDs?