Set dialog owners to VS window

Fix #881.
Update release notes
Add validation of folder name.
Merge pull request #884 from ForNeVeR/dirname-validate

Folder name validation
Maintainer sections added to README
Merge pull request #882 from dungpa/window-focus

Set dialog owners to VS window
Don't display smart tags on empty interface

Also filter out duplicated members.
Fix #828.
Add VS unit tests for implement interface
Add a simple way to recognize fully-implemented interfaces
Fix AppVeyor build
Merge pull request #890 from dungpa/empty-intf

Improve implement interface feature
Bypass unsupported attribute arguments

Close #831.
Use current module/namespace as an implicit open declaration

Fix #832.
No longer display 'AttributeUsage'.
Merge pull request #891 from dungpa/unsupported-attributes

Bypass unsupported attribute arguments
Fixed some issues that were causing rebuilds after the latest F# preview
Merge pull request #892 from rojepp/fix_incremental_build

Fixed some issues that were causing rebuilds after the latest F# preview
switch to FSC to determine Printf specifiers
update FCS to version 0.0.81
Merge branch 'new-printf-specifiers-colorization' of https://github.com/vasily-kirichenko/FSharpVSPowerTools into new-printf-specifiers-colorization

Conflicts:
	paket.lock