trackpoint: Add emulateWheel option
libdiscid update from 0.2.2 to 0.6.1
chromaprint: switch FFT implementation to ffmpeg, build fpcalc

FFmpeg is prefered over FFTW3, and a mutual dependency of picard and acoustid-fingerprinter
picard: fix libdisc and acoustid fingerprinting issues

fpcalc is the external fingerprinter, not acoustid-fingerprinter
Merge pull request #3558 from geerds/trackpoint

Add "emulateWheel" option for trackpoint configuration
haskellPackages.markdown: New expression
haskell-dns: update to 1.4.4
haskell-github: update to 0.11.0
haskell-hakyll: update to 4.5.4.0