Move away from Cake

[alkampfergit]

Cake build was created in the very first implementation of the library. We need to get rid of the cake build system and generate a simple powershell based build file.

I've created simple build file for other project like in this project https://github.com/alkampfergit/KernelMemory.Extensions/blob/develop/build.ps1 where I run gitversion, run tests and create packages with symbols.