Added EngineFilterLinkwtzRiley
Added filter analysis functions
Added a LinkwitzRiley8EQeffect stub
git added Linkwitz-Riley mix to the Eq effect
disabled IIR_ANALYSIS
Added gain ramping
Merge branch 'master' into linkwitzriley
Merge remote-tracking branch 'upstream/master' into linkwitzriley

Conflicts:
	build/depends.py
	src/effects/native/nativebackend.cpp
	src/engine/enginefilteriir.h
Moved guarding flags to LinkwitzRiley8EQEffectGroupState and initalize them with the starup values.
Added some comments to the IIR_ANALYSIS switch
Swap gains when ramping, fixes crackling.
Merge remote-tracking branch 'upstream/master' into linkwitzriley

Conflicts:
	build/depends.py
	src/effects/native/nativebackend.cpp
removed Butterworth8EQEffect
Revert "Revert "raise dlgcoverartfullsize to the top""

Fix the segfault instead of reintroducing the bug -.-
Qt takes care of deleting DlgTrackInfo now

We don't need to delete it manually anymore. This is also the reason
there was a segfault on destruction before because we tried to delete
an object that was already deleted.
Add utopic control file and add libopus-dev/libopusfile-dev to depends.
Merge remote-tracking branch 'upstream/master' into linkwitzriley
Merge pull request #299 from daschuer/linkwitzriley

Linkwitzriley 8 EQ Effect
Merge branch 'master' of https://github.com/mixxxdj/mixxx into coverArtSupport