Include Capabilities preference page into jbdevstudio product

Currently there is no way to enable/disable capabilities to see hidden nodes in preferences/properties dialogs. It might be needed as a backup to be able to debug for example tern related issues.

Current approach is using capabilities to hide Tern category from Preferences and Properties dialogs. If something goes wrong there is no way to see preferences and properties in hidden categories, because Capabilities Preference page is not included into ibdevstudio product. Before it was included by default but in Mars release it seems moved to EPP side. For example Committer Package does not provide Capabilities preference page, but Java EE Package does.

In current devstudio product package preferences categories looks like

as you see there is no Capabilities node in categories tree (1) because Capabilities preference page is not defined for jbdevstudio product and Tern node (2) is filtered out by default. It means in case of any problem with tern it is not possible do enable tern console tracing using Tern Preferences or see node.js configuration.

It is probably should be implemented as additional feature/plugin to include it into JBDS product, but it should beexcluded from BYOE feature to avoid preferences categories conflict in case of installation BYOE feature into Java EE EPP.