Auto DJ should show tracks that have been hidden in the library.
remove blue highlight on search box.

themes can still change ::focus styles via stylesheets so there is no usability loss.
remove blue highlight on library sidebar
Merge branch 'master' into autodj-showall
Remember to unhide dropped tracks in autodj.
Also unhide tracks for crates and playlists.
Add eqeffect.cpp to sources list
Create an effect with a 3 band EQ
Register EqEffect
Fix comment
[Coding Style] Each member of a class should be on its own line
Remove the link between the super knob and eq knobs
Use the initializer list for old_low, old_mid, old_high, old_dry
Use a ControlObjectSlave to get the sample rate from the EqEffect
Make the sample rate accessible from descendants of GroupEffectProcessor
Connect the frequency corners from preferences to the EQ Effect
Initialize m_loFreq and m_hiFreq with 0 in initializer list
Fix typo in control.h
Do ramping after setFrequencyCorners() (not working properly yet)
Do a cross fade without using an additional buffer (not working properly yet)