In particular, move \file stanzas inside groups.

This confused Doxygen and hid hypothetically invalid casts.

If a portable/ folder is next to the libvlccore.dll binary, it will use
it for most configuration and other files.

Close #9751, #2114 and #12679
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

problem reported by Timothy B. Terriberry" <tterribe@xiph.org>

fmt cat is checked/mapped earlier against handler

Close #14803

Also adds the missing restart on MP4Leaf demux mode

8 and a half years should have been enough to transition.

Linux manual strongly advises against using tempnam().

This workarounds a bug in the cocoa framework.

close #9903

This is the target called from our makefile scripts. Rename it
so it is more clear that it should not be called in Xcode
directly.

This adds several build targets to the project for doing all needed
steps for compilation.

Additionally, they are some schemes included which are intended
to be used for compilation:
- "Rebuild everything" builds all targets in the right order, including
  extras/tools, contribs, bootstrap, configure, make and make VLC-dev.

  This scheme should be used once to setup everything. For later
  builds, you should switch to the Make project scheme.
- "Make project" runs "make && make VLC-dev.app", to only recompile
  files if needed. Additionally, it creates a VLC-dev.app for testing.

The end result will be stored in the build folder set in Xcode. Both
VLC.app and VLC-dev.app can be accessed by using the "Build artifacts"
folder, and showing the files in finder.

file is already utf8 encoded, since it is a string that comes from
the theme.xml description file, and therefore it is expected to be utf8.

- on Windows, the ressource paths are already UTF8 encoded. bug fixed
- on Linux, the function is a noop
- on OS2, config_GetDataDir() may need a fix (two paths, the former returns
locale, the latter UTF8)