Bugfix

Fixes a bug when, sometimes, the cursor did not get hidden when playing.
This is because a css property that I couldn't find any reason for it to
be there, so I removed without any problem, that I know of.

Also fixes a path in player.html, loader.gif.

Added a shadow to improve visibility of subtitles on white scenes.

Algo updated .gitignore to ignore .mp4 and .srt. I don't know about you, but when debugging I play local files to avoid downloading a torrent in every test.