core: rename mbgl namespace to mln (#4487)

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

render-test/file_source.cpp

@@ -9,7 +9,7 @@
 
 #include "file_source.hpp"
 
-namespace mbgl {
+namespace mln {
 
 std::atomic_size_t requestCount{0};
 std::atomic_size_t transferredSize{0};
@@ -63,11 +63,11 @@ std::unique_ptr<AsyncRequest> ProxyFileSource::request(const Resource& resource,
     return defaultResourceLoader->request(transformed, [=](Response response) {
         if (transformed.loadingMethod == Resource::LoadingMethod::CacheOnly && response.noContent) {
             if (transformed.kind == Resource::Kind::Tile && transformed.tileData) {
-                mbgl::Log::Info(
-                    mbgl::Event::Database,
+                mln::Log::Info(
+                    mln::Event::Database,
                     "Resource not found in cache: " + transformed.url + "(" + transformed.tileData->urlTemplate + ")");
             } else {
-                mbgl::Log::Info(mbgl::Event::Database, "Resource not found in cache: " + transformed.url);
+                mln::Log::Info(mln::Event::Database, "Resource not found in cache: " + transformed.url);
             }
         }
 
@@ -123,4 +123,4 @@ size_t ProxyFileSource::getTransferredSize() {
     return transferredSize;
 }
 
-} // namespace mbgl
+} // namespace mln