General: Migrate over to fmt where possible

Migrates lingering instances of the old logger over to fmt where
applicable. This allows removing some of the old defines and functions.

The only remaining usages of the printf-based variant of the logger is
in Tests/LinuxSyscalls/Syscalls.cpp for the strace handling.

Source/Tests/UnitTestGenerator.cpp

@@ -2386,7 +2386,7 @@ int main(int argc, char **argv, char **const envp) {
 
   auto Args = FEX::ArgLoader::Get();
 
-  LOGMAN_THROW_A(!Args.empty(), "Not enough arguments");
+  LOGMAN_THROW_A_FMT(!Args.empty(), "Not enough arguments");
 
   FEXCore::Context::InitializeStaticTables(FEXCore::Context::MODE_64BIT);