Add file: scheme to links

See http://qt.gitorious.org/qt/qt/commit/5f161591b6ae25524b129bf4a41d6438f0a4d402 and https://bugreports.qt-project.org/browse/QTBUG-24077
Due to security reasons, links without scheme are not loaded.
OSX is not for developers

Another dirty workaround cause XCode GCC comes from the stone age
Prepared the ground for Windows audio capture

Moved FFTW dependency in audiocapture.cpp
Fixed windows wrong include
Fixed OSX portaudio/UI dependency
Filled Windows audio capture code. Not tested yet.

Fixed window applied to pre-FFT audio data
Started to improve spectrum bars height calculation
Fixed channel selection layout warning
Implemented audio capture double buffer on Windows
Merge pull request #138 from janosvitok/doc-fixes

Doc fixes
Added fixture: SGM Giotto Spot 400 CMY (thanks to Willy)

Added fixture: PixelRANGE PixelPar 44 (thanks to bwerst)
Fixed wrong loading of Generic RGB fixtures
NEW: Shows can now be started at any position in time

Chasers can now be started/tested from any step
Give some copyright to the libbeat creator
Compressed Scene Editor icons to save screen vertical space

Hide Chaser Editor in Show Manager when changing Show
Enlarged Audio Trigger Factory a bit
Scene Editor now uses global clipboard too, so values can be copied from a Scene to another

Copy and paste is now allowed in "all fixtures view" mode too
Fix MIDI ALSA backend closure when no audio card is present
Some Robe fixtures improvements
Make VC widgets selection more visible
Merge branch 'master' of github.com:mcallegari/qlcplus
Audio files can now be added from Function Manager