Qt4 - small fixes... Remove one redondant connect, block the access to the speedSlider if there is no input.

Qt4 - Open Disk. Provide a button to eject the disk drive. has been requested twice on the forum. Maybe should be moved somewhere else. The intf_eject doesn't seem to work on my computer now...

at all

* fix pthread support for x264 on win32
  - Not sure at all the configure.ac part is right, anyone more knowledgable, please check.

vlc_app: New media layer view. Enabled by default. Set bindings from resources. (This commit is way too large.)

Close #493

Patch from atmo.

SHM is autodetected, so there is not point in disabling it by force.

item-change for IM callback.
Check callback and handle other than interface-update stuff only if they
have same id than current input

Should fix that meta not showing/too many signals sended in beginning.
Shouldn't break anything (as always ;)