* Enable Insurgency and Blade Symphony x64 builds
The HL2SDKs were updated to support compilation and linking on x64 before. #67 allowed to load MMS on Blade Symphony Win64. AMBuild 2.2 allowed to build for multiple architectures in one build script on Windows.
#76
* Add Insurgency to AppVeyor SDKs to test win64 builds
* Try to enable x64 builds on appveyor
* I don't know PowerShell syntax
* Split the envvar before usage
Thanks psychonic!
