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To reduce to number of HTTP requests

use lapi for flv info, and html5 api for room info
#10153 #10318

Ref: #10304

Closes #10415

Closes #10363

In the original mtvservices:embedded test case, config.xml is still used
to get the feed URL. Some other examples, including test_Generic_40
(http://www.vulture.com/2016/06/new-key-peele-sketches-released.html),
and the video mentioned in #10363, use another endpoint to get the feed
URL. The 'index.html' approach works for the original test case, too. So
I didn't keep the old approach.

Bilibili now uses emscripten, which is very difficult for reverse
engineering. I don't expect it to be fixed in near future, so I mark
it as broken.

Ref: #10375