* Beginning of core implementation

  my algorithm is still not perfect: it should take account of the "thumb length"

  but I don't have a real video/audio file to test it...

instead of the painfully braindead one from wship6 that we'd rather
flatly ignore

Microsoft was probably too much afraid that developpers would request
version 0.2 instead of 2.0 so they switched straight from 1.1 to 2.2.

* If we are passed a SUB file as subtitle, just open the IDX instead, if there is one. (Closes: #681)

fixes for crash in Safari plugin when terminating (it actually locks the computer completely on some occasion)
- opengl.c: let End destroy elements created by Init, DestroyVout for CreateVout
- voutgl.m: set context to NULL on exit

  inputs are not yet added to the playlist

* Add a "playlist-tree" option to force onelevel/catgory mode

 * skins2/parser/interpreter.cpp: Check the VarMAnager first before trying to parse the action. This fixes a bug with dvd.isActive and LayoutID.isActive

  + cosmetic changes

  Kids, don't try this at home...

20 GOTO 10