cosmetics.

Fix some segfaults by disabling functions.
Slower, faster are on the side of the slider now.

 - Don't use the .ui, do all by hand :)
 - Use a ControlWidgets to design all the controls, and implement the functions
 - Change a bit the advanced widget, that must be integrated in the
   controlsWidget
There is a lot of Not Yet Implemented, so feel free to add some.

Redesign the label & edits placement to resize the dialog

control/dynamic_media_list.c: New dynamic media list object. It shouldn't have great performances, but could easily be improved.
The idea is to have create a media list using the item of an other that matches a certain query.

* control/media_list.c: Implement _set_name _add_from_file.

glx: fixed startup crash, which seems to be triggered by an x.org optimization, the GLX module seems to be loaded when it is queried upon, and released when the display is closed. Therefore, checking for GLX with a temporary display and using GLX apis with another will crash it.