std::wstring is problematic, because wchar_t on other platforms might not be what we need. -fshort-wchar can mitigate that partially, but it's more problematic for stdc++ classes.
Also, using UTF-8 for convertion may not be what's intended, esp. if such strings end up being passed back to system API (eg. open file). The patch uses CP_ACP on mingw build (which is how Windows APIs will interpret it) or CP_UNIXCP on Wine (which is Wine extension to convert to whatever glibc and other host libs expect).
It's also needed for the next patch.
Makes it easier to identify the command stream thread and the
queue processing thread easier when using a wine build that
supports SetThreadDescription.
* [util] Adds getTempDirectory() function
Will be used by on-disk pipeline caching
* [dxvk] Implement on-disk shader caching
Saving the pipeline cache to disk when the application exits
should be sufficient but the DxvkPipelineCache destructor isn't
reliably called on exit (ref-counting issue?).
As a workaround every frame we check and save the cache if the
size increased by some amount or after one minute elapsed.
* [dxvk] Periodically update shader cache file in separate thread
