Is your feature request related to a problem? Please describe.
I'm not being able to run Stryker in a project (netframework 4.5) inside a machine that doesn't have VS2017 installed (it has VS2015). Stryker fails when it tries to build the solution.

I ran some tests and found out that it tries to use the MSBuild.exe located at the first path defined on MSBuildHelper's.fallbackLocations.

Currently, the log in the database does not contain any information about the runtime of the individual job_ids. But I think this could be quite an interesting information to have.

The runtime can be logged either as a duration or with two timestamps: start_job and end_job.

The plugin source is currently split into two files, one of which is auto-generated by build.rs. The lib.rs is getting unwieldy. Time to browse for sets of functionality that can be put into their own modules, before navigating the source gets too cumbersome.

Right now the temp dir is deleted after running using a FS2 tempDir Resource. This is done in the MutantRunner.
It'd be nice to have a config option to keep the generated temp dir after running for debugging purposes to look at the generated code. An option similar to [Stry