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
proof of concept inlined svg in skin with variables
tidying inline svg parser
tidying inline svg parser
use of crossplatform temp directory
cleaning code
adding SkinContext getPixmapPath + cleaning
renaming oneStateNode to pixmapNode
inline svg for wslidercomposed
inline svg for wknobcomposed
wpushbutton background
support for wspinny
support for wstatuslight
support for wvumeter
support for wdisplay