changes related to #2674: prompt for sign-in at 5min interval
fixed Content-Disposition header
fix for #2264: call 'Document.OtherDocsRootDocumentSyncStatus'
#2668 - wip
merged from Win env into Mac env
get a new authn token, every time clicking on the 'here' hyperlink
updated type of the message notification icon
change Update button back to Ok in 'Folders to Sync' dialog
add support for ignored files during local FS scan
merged build branch to Mac dev env