Plugins are not included

[ProbablePrime]

Compressonator.NET currently does not handle the plugins that are present with a downloaded CLI build.

Without the plugins, Compressonator Behaves entirely differently to the CLI.

In BC6H for Example, when used with CMP_ProcessTexture:

1. CMP_ProcessTexture calls CMP_CreateComputeLibrary with a request of HPC.
2. CMP_CreateComputeLibrary will create an instance of CCPU_HPC

With plugins, the only difference is that we end up in Plugin_CCPU_HPC.

There's a subtle difference discovered in CCPU_HPC from Plugin_CCPU_HPC. But I will make that issue on Compressonator itself.