Added QXT_XXX_LIB. This makes it possible to check in applications that which Qxt modules are enabled.
Added QXT_XXX_LIB. This makes it possible to check in applications that which Qxt modules are enabled.

mmitkevich/libqxt,mmitkevich/libqxt,mmitkevich/libqxt,hrobeers/qxtweb-qt5,mmitkevich/libqxt,hrobeers/qxtweb-qt5,hrobeers/qxtweb-qt5,hrobeers/qxtweb-qt5,hrobeers/qxtweb-qt5