[linux] fix for mimalloc_fun for Windows and Linux

Old bad behavior.
In Windows and Linux mimalloc_fun will be called >= 2 times:
1) Initialization will remove old file and will keep alive mimalloc_log_path until you exit.
2) Not sure, but I did not see in Windows any other messages, but it's totally possible and I have at least one in Linux.
3) When you press exit you: firstly go to the end of main "return EXIT_SUCCESS;" and after that calling mimalloc_fun

In Windows after exiting main and running mimalloc_fun I got mimalloc_log_path.empty() == true: it remove all previous messages and write only last block of messages.
In Linux after exiting main and running mimalloc_fun I got mimalloc_log_path.empty() == false, but it contain random non ascii chars =>
it will not remove previous messages in mimalloc.log but will create random non ascii filename in current folder

New behavior.
1) For Windows and Linux mimalloc_fun will get "init" arg only once in main when calling mi_register_output and then it will remove old  mimalloc.log.
2) All other calls will write to mimalloc.log without removing it.
3) I have to remove static in GetStashPath() and from "static std::filesystem::path mimalloc_log_path;" to not get random non ascii in Linux.

Author: q4a

src/apps/engine/src/main.cpp

@@ -57,10 +57,10 @@ void RunFrameWithOverflowCheck()
 
 void mimalloc_fun(const char *msg, void *arg)
 {
-    static std::filesystem::path mimalloc_log_path;
-    if (mimalloc_log_path.empty())
+    std::filesystem::path mimalloc_log_path;
+    mimalloc_log_path = fs::GetLogsPath() / "mimalloc.log";
+    if (arg && ((std::string *)arg)->compare("init") == 0)
     {
-        mimalloc_log_path = fs::GetLogsPath() / "mimalloc.log";
         std::error_code ec;
         remove(mimalloc_log_path, ec);
     }
@@ -133,7 +133,10 @@ int main(int argc, char *argv[])
         SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", "Another instance is already running!", nullptr);
         return EXIT_SUCCESS;
     }
-    mi_register_output(mimalloc_fun, nullptr);
+    std::string *mi_arg = new std::string("init");
+    mi_register_output(mimalloc_fun, (void *)mi_arg);
+    mi_arg->clear();
+    std::destroy_at(mi_arg);
     mi_option_set(mi_option_show_errors, 1);
     mi_option_set(mi_option_show_stats, 1);
     mi_option_set(mi_option_eager_commit, 1);

src/libs/util/include/storm/fs.h

@@ -15,7 +15,7 @@ using namespace std::filesystem;
 
 inline path GetStashPath()
 {
-    static path path;
+    path path;
     if (path.empty())
     {
 #ifdef _WIN32 // FIX_LINUX SHGetKnownFolderPath