Multi-configuration projects

[rubdos]

When building a multiconfiguration request, the plugin overwrites the notes from the previous subjobs. This makes it less useful, because you won't see if a build succeeded with the not-most-recently build code.

Eg. I'm using a multiconfigurationjob for building code for Android, iOS, Linux and Windows. The last build was for Windows, but I can't see (in the notes) if the Android and iOS builds succeeded.

[bfulton]

@rubdos, supporting multi-configuration aggregation is a great idea. I'll look at level of effort and let you know what I find.

[rubdos]

Thank you for heaving a look at it :)