Make a clean cut in media-essential when it's 100% open source

[Croydon]

When media-essential is 100% open source we should make a clean cut:

• [x] move the current media-essential to inexorgame-obsolete/
• [x] create a new media-essential
• make sure that flex is able to detect the old version of media-essential, remove the old version and make a fresh clone (!)
  • Since the media repository handling in Flex is broken in many times anyway; I'm going to remove some kind of smooth update way from the to do list for this edge case.

Advantages:

• everything 100% open source in the history
• smaller file size 🎉

Blocked by #256

[Croydon]

Since the media repository handling in Flex is broken in many times anyway; I'm going to remove some kind of smooth update way from the to do list for this edge case.

[Croydon]

Blocked by #256