Icon deallocation fix

specter/include/specter/Icon.hpp

@@ -50,7 +50,13 @@ public:
             for (int r=0 ; r<ROWS ; ++r)
                 m_icons[c][r] = MakeIcon(c, r);
     }
-    void destroyAtlas() { m_tex.reset(); }
+    void destroyAtlas()
+    {
+        for (int c=0 ; c<COLS ; ++c)
+            for (int r=0 ; r<ROWS ; ++r)
+                m_icons[c][r].m_tex.reset();
+        m_tex.reset();
+    }
     Icon& getIcon(size_t c, size_t r) {return m_icons[c][r];}
 };