Add ability to group build tasks

[skarfacegc]

We have two different builds with very similar steps that are all setup as subtasks of the main build. I'd love to have some way to group all of the related tasks so I can tell which "Unit Test" task is which.

The ability to add an arbitrary prefix to the task name would work as well (I think I saw that in another issue), but the ability to group would work a bit better imo.

[REBELinBLUE]

I'd love this also, even if it is just allowing you to manually create folder which you have to move projects into yourself.

Currently my menu looks like the following so I have to set it to just show failed builds but that gets rid of the advantages of being able to open the URL for any of the projects from the menu.