Merge back new DXC version's main

…linked but only to be used as a dependency rather than CLI. To keep existing functionality, this define has to be set before including dxcapi.h and the library calling has to call DxcInitialize at the start of the program (or at least before calling any DXC function) and DxcShutdown when DXC should be cleaned up correctly. When enabling static linking, the CLI projects are disabled since they assume dynamic linking. DllMain has been modified to deal with this properly as well.

…et's see if this gets linux to compile

…ese commits need to be cleaned up at some point because it's very hacky, but it seems to build & link on Linux (execution isn't tested yet). Proper fix is fixing the dependencies, but ain't nobody got time for that.

… prevent recursive issues that's present on linux builds (but only on GitHub CI runners?)

…onflicts

…iler

…ble to change the path that pointed to optimizer.hpp