yotube plugin

[adrianoluis]

- OAuth: use try except for all HTTPSConnection functions
Fix GSOD on response problems.
- YouTubeVideoUrl: Fix age-gated videos support without login, thx dstftw
- YouTubeVideoUrl: Improve extraction in 429 error conditions, thx dstftw
- YouTubeVideoUrl: Improve age-gated videos extraction in 429 error con…
- YouTubeVideoUrl: Remove outdated code, thx dstftw
Additional get_video_info requests don't seem to provide any extra itags any longer.
- OAuth: fix GSOD in get_new_token if response status is not OK

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[adrianoluis]

enigma2-plugin-extensions-youtube_h1+git499

● YouTubeSearch: optimize get charset in getGoogleSuggestions
● YouTubeVideoUrl: fix video extraction on Python3
● 2to3 create Python 2 and 3 compatible code
● Fix travis tests after last commit
● Again try add python 3.8 in travis tests

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