figments: drop unused perfcounter class

src/sprites/Blob.h

@@ -2,7 +2,6 @@
 
 #include <Figments.h>
 #include <ArduinoLog.h>
-#include <Perfcounter.h>
 
 class Blob {
   uint8_t m_pos;
@@ -51,7 +50,6 @@ public:
   }
   
   void render(Display* display) const {
-      PerfCounter _("blobRender");
       const uint8_t width = 25;
       auto map = display->coordinateMapping();
       // Grab the physical pixel we'll start with