Move Storage Attributes to DocBroker

[Ashod]

This resolves a number of long-standing races and issues with capturing and setting Storage attributes. For full details, please see the commit logs. A number of commented/disabled assertions around said flags are now finally enabled.

Best to review this one commit at a time.

• wsd: remove unused uploadLocalFileToStorage
• wsd: mark last-upload as failed in early-failure
• wsd: track modifying user commands
• wsd: state-dumping and comments
• wsd: move storage attributes to DocBroker
• wsd: test: modernize UnitWOPIAsyncUpload_ModifyClose
• wsd: test: enable IsModifiedByUser assertion
• wsd: test: move UnitWOPIStuckSave