Remove VS2010 support.

This PR is to be merged after 1.7.0 is out.

TODO:
- [x] Remove workaround for the C4005 warnings
- [x] Embed the manifests with manifest tool
- [x] Check if everything is fine with `OmitFramePointers` `/Oy` disabled for Win32 (see [Ticket #1413](https://trac.mpc-hc.org/ticket/1413))
- [x] Remove `ImageHasSafeExceptionHandlers` and `IgnoreSpecificDefaultLibraries`