Subadub for twoseven.xyz

Original work done by rsimmons (https://github.com/rsimmons/subadub/). Updated to work on twoseven.xyz.

The following is borrowed from the original subadub extension (https://chrome.google.com/webstore/detail/subadub/jamiekdimmhnnemaaimmdahnahfmfdfk?hl=en-US):

Enhanced Netflix subtitles for foreign language study
➤ Subtitles are displayed as selectable text, so you can copy+paste them to make flash cards and look up words in a dictionary (e.g. using the Yomichan or Rikaikun extensions for Japanese)
➤ Full subtitles for a video can be downloaded in SRT format for personal study/review