Project parser assumes 'Library' for `OutputType` if not set

[prochnowc]

Hi.

I've found a Bug in the project parser which assumes Library for OutputType if it's not specified.

Cake.Incubator/src/Cake.Incubator/Project/ProjectParserExtensions.cs

Line 882 in d98c041

var outputType = document.GetFirstElementValue(ProjectXElement.OutputType) ?? "Library";

Actually the default OutputType depends on the SDK.
For the Microsoft.NET.Sdk.Web SDK it defaults to 'Exe'.