Abstract the VideoJS Player away from Lime Player as much as possible

[szabyg]

This will allow to support other media player frameworks.
Basically we need a couple of things from the player we use:

• A DOM element always the size and be exactly over the video tag DOM element. (this can be used to show overlays, spacial annotations)
• A DOM element on the control bar for buttons (This can be used for e.g. switching the overlays on/off)
• A DOM element always the size and exactly over the timeline. (This can be used for visualizing the time-based annotations)
• METHODS:
  • play()
  • pause()
  • seek()
  • getTime()
  • getLength()
• EVENTS
  • timeupdate
  • fullscreen
  • loaded