this is intended to create nightly build with package
versions of the form x.y.z-yyyyMMdd.sha and
push them to nuget automatically, only where there
are new changes per day. since devops is a nightmare
and entirely untestable we will have to go through 20
iterations to actually get this to work
each time we want to up the version number of the nuget package it involves opening every csproj and manually updating the version. this script updates the version for all projects, except the test project, in the 'src' folder.