New Folder + Move Folder Up + Move Folder Down

Reflection-based folder organization support
Folder Commands - validation, cleanup

Removed Rename command
Added project-wide folder name validation
Little refactor based on comments
Folder commands - little bugfix and cleanup
comments-based refactoring
getFolderNames... duplication fix
Merge branch 'folders' into fsprojects_master

Conflicts:
	src/FSharpVSPowerTools/PowerToolsCommandsPackage.cs