Add functionality to add/remove captions from selected slides by default (unless all slides option ticked)
Update About window to latest version
Conflict resolved.
Merge pull request #363 from PowerPointLabs/Issue_345

Issue 345: Add functionality to add/remove captions from selected slides by default...
Remove support for all slides caption add/remove in ribbon (as multiple add/remove has been added)
Merge branch 'Issue_365' into Feature-AudioRecord

Conflicts:
	PowerPointLabs/PowerPointLabs/Models/PowerPointPresentation.cs
	PowerPointLabs/PowerPointLabs/PowerPointLabs.csproj
	PowerPointLabs/PowerPointLabs/Ribbon1.cs

Conflicts resolved.