1. NameSpace almost work on iOS

2. Upgrade to iOS 13, watchOS 6
3. Dont mkPath() on ReadOnly mode

Core/MemoryFile.cpp

@@ -36,8 +36,10 @@
 #    include <dirent.h>
 #    include <cstring>
 #    include <unistd.h>
+#    include <filesystem>
 
 using namespace std;
+namespace fs = std::filesystem;
 
 namespace mmkv {
 
@@ -418,6 +420,13 @@ size_t getPageSize() {
     return static_cast<size_t>(getpagesize());
 }
 
+extern MMKVPath_t absolutePath(const MMKVPath_t &path) {
+    fs::path relative_path(path);
+    fs::path absolute_path = fs::absolute(relative_path);
+    fs::path normalized = fs::weakly_canonical(absolute_path);
+    return normalized.string();
+}
+
 #ifndef MMKV_APPLE
 
 static pair<MMKVPath_t, int> createUniqueTempFile(const char *prefix) {