[Scenario] Add link icon

Add icon for link button to external resources,
for use in info view for Activity Type.
[Scenario] Use link icon in Activity Type Info View
[Scenario] Fix border for external link

Change border color for text field used for
entering external link for Activity Type
components in the Info View, such that the
color matches the rest of the Info View UI.
[Scenario] Add class doc to Activity Type's visual control
Merge pull request #107 from VWoeltjen/mctPlugins103b

[Scenario] Clean up UI for Activity Type's info view