IDE: Cheat sheets | declare feature under licensing using bundle manifest

[eparovyshnaya]

Chat sheets development is rooted in the necessity of lowering the barrier to entry for a developer, who's going to use Passage, but does not know how. For mode details see #561556

Starting point for employing acess cycle is to declare set of features for licensing procestion. Such a declaration is called Licensing Requirement and represented as Requirement class.

There is a general interface to provide these Requirement at runtime.

There is also two equinox-based implementations of these interfaces, one of 'em allows a developer to declare a funture for licensing protection by means of bundle manifest.

In the scope of this a cheat sheet should appear which

• explains and
• llustratively implements this approach

thus a developer can

• see precisely how to declare a feature for licensing protection by means of bundle manifest
• understand how does it work and can alter the process for one's needs

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Version: 0.8.0
Ported from bugs.eclipse.org: 561558