move tile size to a cpp file

include/llmr/util/constants.hpp

@@ -8,7 +8,7 @@
 namespace llmr {
 namespace util {
 
-static const float tileSize = 512.0f;
+extern const float tileSize;
 
 }
 }

src/util/constants.cpp

@@ -0,0 +1,3 @@
+#include <llmr/util/constants.hpp>
+
+const float llmr::util::tileSize = 1024.0f;