Fix overlay rendering issues that lead to crashing when other overlays are present

[Kaldaien]

I have been getting several reports from Special K users of crashes when using this mod, and finally had some time to investigate.

Primary issues found:

1. Code to show/hide the hardware cursor does not handle pathological case where something is preventing the cursor's state from changing -- infinite loop.
2. DisableThreadLibraryCalls (...) used in a DLL that uses MSVCRT managed thread_local storage.
3. A single command allocator/list was being used for all frame contexts, despite creating per-context allocators.
4. The game's window title was being used to find the main window, but this is highly volatile; use window class name instead.

[maximegmd]

Thank you very much for the contribution.

I also believe there was a discussion regarding our hooking methodology not handling the SL proxy correctly but did not investigate more.

[WSSDude]

Seems good to me, but dont think this really resolves any fencing issues we currently have and I am trying to fix. Or does it? Would be suprised considering issues I found, including leaking SRV heap and such...

But should be an improvement I believe still for now. I am rewritting whole hook, had this fixed there among other things, no need necessarily I suppose to do anything on your part with this, just for a note. This is definitely not everything we do wrong atm unfortunately.