Add support for temporary object (stream) columns

Adds support for temporary object column types (O0) to DTF; otherwise,
exceptions are thrown when enumerating tables of a session object.
Make Burn decrypt encrypted payloads after moving/copying to the package cache.
Make DTF set the current directory for a managed custom action to the AppDomain's BaseDirectory.
Update .NET 4.5.2 on Win7 RTM message.
Merge pull request #97 from rseanhall/net452message

Update .NET 4.5.2 on Win7 RTM message.
Merge pull request #96 from rseanhall/bug4458

WIXBUG:4458 - WiX DTF Custom Action Current Directory Different When Interop is in GAC
Merge branch 'bug4459' of git://github.com/rseanhall/wix3 into develop

Conflicts:
	History.md
Merge branch 'DTF' of git://github.com/heaths/wix3 into develop

Conflicts:
	History.md