Extra process commands

[jhoneill]

PR Summary

1. Added Commands Add- and Set- -VSTeamProcess. Add- creates a process template based on a pre-existing one, Set- enables/disables, sets the default for new projects and changes the name / description.
2. Added Commands Get- Set- Add- -Remove -VSTeamProcessBehavior and a format XML file for process behaviors. (a.k.a boards). Combined with (1) allows creation of a custom process template with its own boards.
3. Added Commands Get- Set- -VSTeamWorkItemBehavior and a format XML file for WorkItem behaviors. These work with boards from (2) or with a custom-templates built-in boards to add work item types to a board.
4. Changed command Get-VSTeamIteration adding a switch -Expand to return all the iterations returned by the -Depth option, rather than one with a children node where each element may have children.
5. Added Commmands Get- and Set- -VSTeamSetting - to allow bug behavior and visibile boards (and things set with them) to be set. Otherwise the boards from (2) can't be seen.

PR Checklist

• [x] Write Help
• [x] Write Unit Test
• [x] Update CHANGELOG.md

Test count now at 735. Tests for settings are fairly simple, others more sophisticated. Text above is in the change log. Note that this depends on #361 but not on #362