core: rename mbgl directories to mln (#4511)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

include/mln/util/util.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#ifndef NDEBUG
+
+#include <thread>
+#define MBGL_STORE_THREAD(tid) const std::thread::id tid = std::this_thread::get_id();
+#define MBGL_VERIFY_THREAD(tid) assert(tid == std::this_thread::get_id());
+
+#else
+
+#define MBGL_STORE_THREAD(tid)
+#define MBGL_VERIFY_THREAD(tid)
+
+#endif
+
+// Compiler defines for making symbols visible, otherwise they
+// will be defined as hidden by default.
+
+// clang-format off
+#ifdef WIN32
+    #ifdef MBGL_BUILDING_LIB
+        #ifdef __GNUC__
+            #define MBGL_EXPORT __attribute__((dllexport))
+        #else
+            #define MBGL_EXPORT __declspec(dllexport)
+        #endif
+    #else
+        #ifdef __GNUC__
+            #define MBGL_EXPORT __attribute__((dllimport))
+        #else
+            #define MBGL_EXPORT __declspec(dllimport)
+        #endif
+    #endif
+#else
+    #define MBGL_EXPORT __attribute__((visibility ("default"))) // NOLINT
+#endif
+// clang-format on