Removed random engine, using libscnumerics instead

src/ScreensaverPlugin.hpp

@@ -10,7 +10,6 @@
 #define _ScreensaverPlugin_H_
 
 #include <cairo/cairo.h>
-#include <random>
 
 class ScreensaverPlugin {
     public:
@@ -26,8 +25,6 @@ class ScreensaverPlugin {
     protected:
         cairo_t* _c {nullptr};
         cairo_rectangle_t _r {};
-        std::random_device _dev {};
-        std::default_random_engine _eng {_dev()};
 
         void make_black();
         cairo_rectangle_t random_rect();