* objects.c: some more vars command stuff

* Added a minimal streaming feature

Sync default options in NSIS installer with recommended preset. I still don't like installing the activex and mozilla plugins by default as they often override other plugins and make it impossible to view videos on some/many websites.

Fix [17577]. Removing 200 lines of code is nice. Replacing them with lines that does the same thing as before is better.

* Add right-click "info" item in qt4 playlist

The scheme I used sucked big times.

- move vlm to input/
- remove unused libvlc export

Compile glx plugin only if all required headers are present

* libvlc sources and plugins now define __LIBVLC__ and headers exported to
  plugins (ie, include/vlc_*.h) check for this
* libvlc sources use the value of the "libvlc" component in vlc-config instead
  of vlc
* Apply flags directly to "libvlc" in configure.ac - might temporarily break win32 :)