New Button to the right of the open project button:
label "Close All Projects"
icon TBD - probably red X
Close and remove all projects from project explorer
Remove all project top level entries in Map ToC.
Leave any other entries in project tree (i.e. non-RAVE related layers).
Context
I am favouring this issue over #36 which refers to a context menu on each project. Semantically right clicking on a project should only provide access to functions that alter that individual project. close ALL projects belongs at a higher level, hence the toolbar.
It would be very nice to have a command to "Close All Projects" when we have a lot open.
This is same feature as: https://github.com/Riverscapes/RaveAddIn/issues/129