Updated dependencies: debugger-libs removed Mono.Nunit dependecy which currently(with mono 5.12), mcs throwing errors about Nunit.
cecil was removed because debugger-libs added it as nuget's package dependency.
I've pushed the dependency changes to master separately as there was a bit more work needed for the new dependencies from debugger-libs. I included your changes to switch to MSBuild.
Updated dependencies: debugger-libs removed Mono.Nunit dependecy which currently(with mono 5.12), mcs throwing errors about Nunit. cecil was removed because debugger-libs added it as nuget's package dependency.