Implement n-param descrambling using JSInterp

[dirkf]

Fixes ytdl-org#29326, closes ytdl-org#29790, closes ytdl-org#30004, closes ytdl-org#30024, closes ytdl-org#30052,
closes ytdl-org#30088, closes ytdl-org#30097, closes ytdl-org#30102, closes ytdl-org#30109, closes ytdl-org#30119,
closes ytdl-org#30125, closes ytdl-org#30128, closes ytdl-org#30162, closes ytdl-org#30173, closes ytdl-org#30186,
closes ytdl-org#30192, closes ytdl-org#30221, closes ytdl-org#30239, closes ytdl-org#30539, closes ytdl-org#30552.

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