This patch proposes a fullscreen controller for the skins2 interface.
it features the following :
- skinable fsc (desciption in theme.xml with the Window tag)
- only restriction : no spawning of subwindows or dialogs
- window is considered a fsc when id="fullscreenController"
- (de)activation by clicking on the middle button of the mouse (intf-show)

This fsc currently only works for Linux (new vout design).
For Windows, it is a noop as long as the old vout design is still valid.

It was duplicated with es_format_t::i_sar_num/den.

a function updateShape must be called __after__ the layout is rebuilt and __before__ the window is refreshed.
This function call was misplaced and resulted in applying an empty mask and concealing the final window

Some stuff are still broken in the IconView.

Specific attributes can be selected at creation of windows depending on type

CamelCase for function names
No variable prefix
No space after function name
Starting braces on the same line than keyword

Some framebuffers do not use rgb (dm6446 use UYVY for example)

remove unneeded id3tag, add ffmpeg (builds with recent binutils)

Add empty lines between functions

Provide playlist._repeat() instead (and keep the old .repeat in case
anybody was using playlist["repeat"] to workaround the reserved keyword
issue).

Add experimental album art support (http://localhost:8080/art). Can only be used for the current playlist item.

Fix acl use in http interface. Change default host to 0.0.0.0:8080. The default .hosts file still limits access to default host.