- I get crashes when the MainThread does it's "FlushAllWindows".
    Quite possibly related to the fact that Carbon windows are not threadsafe..
  - I tried implementing similar behaviour in the mozilla plugin itself,
    but I cannot get it to even RENDER from there, so this will have to do for now.

Please review as the merge process is not an exact science.

make update-po

mediacontrol_core.c: remove handling of the start position for mediacontrol_start, it crashes the application