piperlib.dll is compiled with Debug Flags and won't work without Debug DLLs

[bowlingforsoap]

The piperlib.dll has Microsoft dependencies on debug DLLs (with a "D" in the end). Apparently, the DLL was compiled with debug flags, and if you try to use it on a machine that doesn't have the Visual Studio's debug versions of the DLLs, it will fail to load the dependencies and the app won't work properly. Installing Microsoft Redistributables won't help, since it installs release versions of these DLLs.

Steps to reproduce:

1. Make sure Visual Studio C++ tools are not installed
2. Build a Unity project with UnityPiper (I guess you will not be even able to build, cause it's gonna complain about the DLL at this point)
3. Run the build project
4. You'll find something along the lines in the Player.log:
   Plugins: Failed to load '.../Plugins\x86_64/piperlib.dll' because one or more of its dependencies could not be loaded.

[mrtrizer]

Unfortunately I don't have time to fix this. If you managed to build it with release, I would appreciate a PR. I don't have time to work on this project, because of family reasons.