Implement stepping via KEY_SPACE

src/main.cpp

@@ -152,6 +152,11 @@ int main(void)
       format_str_width = MeasureText(format_str.c_str(), FONT_SIZE * 2);
     }
 
+    if (IsKeyPressed(KEY_SPACE))
+    {
+      state.pause_work = !state.pause_work;
+    }
+
     // Draw
 
     ClearBackground(BLACK);