Add an edge representation for IncludeUseCaseUsage in the General View diagram

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Add a way manipulate IncludeUseCaseUsage from the General View Diagram.

This issues should provide:

• An Edge Mapping to represent an IncludeUseCaseUsage
• A way to create a IncludeUseCaseUsage using an edge tool
• A way to delete a IncludeUseCaseUsage edge
• A way to reconnect source/target edge of a IncludeUseCaseUsage

Here is a sample use:

use case 'Including Use Case' {

include 'Included Use Case';

}

use case 'Included Use Case';

Here is what it should look like: