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
Attempt at CO aliasing (not working yet)
We don't need to check if the alias has a creator
Create a method inside MixxxMainWindow for initializing aliases and call it before loading the skin and initializing controllers
Introduce a new mutex to guard access to s_qCOAliasHash
Some minor tweaks to equalizer effect:

* Rename to Butterworth EQ (since Default is not very meaningful and unclear given
  we have two types of EQs).
* Fix memory leak.
* Get translations for parameter descriptions.
Rename EQDefault class to ButterworthEQEffect.
Create new appstore scons option for Mac App Store builds.

Disables the reverb effect and vinyl control, which are not available
with the App Store Exception.  Attempting to enable vinylcontrol=1
with appstore=1 will not succeed.
Merge pull request #266 from leematos/patch-2

Remove blue glow from searchbox & library sidebar
Ensure that Mac App Store build options are explicitly Mac-specific.
Merge pull request #289 from ywwg/mac-disable-reverb

Create new appstore scons option for Mac App Store builds.
Rename createAlias to insertAlias
Add unit test for alias retrieval
Fix enabling sync crashing without vinyl control support.
Fix building app store version by default -- should be off.
Merge pull request #283 from badescunicu/co_alias

Add Control Aliasing
DN-MC6000MK2: Initial revision
DN-MC6000MK2: Map some controls and the VU meter LEDs directly
DN-MC6000MK2: Looping

- Loops: Manual, beat and beatroll
- Censor: Use reverseroll instead of reverse
- Scratching: Don't modify keylock mode
DN-MC6000MK2: Track loading

- Solo cue mix when loading a track (can also triggered manually
  by pressing Shift + Cue Mix)
- Slip mode fixes (still does not always work as expected)