FsiEvaluationSession.EvalExpression exception and error handling

EvalExpression and EvalInteraction need to have better specified exception behaviour

• Return ErrorInfo[] for warnings and errors from parsing and typechecking
• Directly raise exceptions from execution (preferably without losing the callstack)

[forki]

I could use this in https://github.com/fsharp/FAKE/blob/master/src/app/FakeLib/FSIHelper.fs#L118 too

[dsyme]

Fixed by #475