macosx: CAS: enforce the chosen encapsulation format's file extension for the destination selection panel

Note that the extension isn't magically switched yet when choosing a different encapsulation format after your output destination.

Panel is fully functional now and needs testing.

macosx: CAS: fixed crash on quit and limit the OK button to be enabled only if both an input and an output is set

Note that by default, we will compile for the HOST OS instead of OS X 10.6, which is the way it should be.

Those lists are supposed to contain language codes, not language names.

...rather than in the language's own spelling or in English.

This was apparently put in place to work around the lack of language
setting in BeOS. Then it was extended to Windows and MacOS since
gettext failed to retrieve the user language configuration.
BeOS is no longer supported and Windows support and MacOS support were
fixed in gettext 0.18.

Also calling setlocale() from a library can crash.

This code might have had some effects on some other OS (BeOS?), but
it should not be required on Windows. Also good-mannered and
thread-safe libraries do not modify the environment.

This is the second time this commit is applied. Consider this is the
last warning for French translation. Any new revert of my corrections
without explanation will be re-reverted without further notice.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This can save on TCP packet if Nagle somehow fails, and work around
bugs in some broken HTTP servers.

this fixes a really nasty window layout mixing foreign windows with
the fs controller and the video, when activating while window is inactive

close #4397

close #7117