Decorate icon of bound roles

[stephan]

It would be great if a label decoration would show if a role is bound to (playedBy) a base class. This decoration should be placed in the upper-right of the icon: this corner normally holds the static decoration which is not applicable to roles anyway.

[stephan]

Implemented in r19731 as shown in this snapshot (note, that Company is an unbound role):

Further note that the abstract decoration ("A") also applies to roles and also occupies the upper right corner. In outline and other views this looks OK, in the package explorer a double decoration for bound abstract roles looks crowded, but that's the way the package explorer works for other combinations, too.

[stephan]

r19738 extends the solution to apply to binary types, too.

The implementation uses the CallinRoleBaseBindings attribute while initializing all roles from the InnerInfo of their enclosing team.

• ClassFileReader stores a map role->base
• ClassFileInfo fetches base class name and pipes it into OTModelManager.addType()
• lookup of a BinaryRoleType's baseclass directly finds the !IType in the project using the stored qualified name
• RoleType also prepares for reading anchored base types from binary (not yet tested)

[stephan]

Further improvements from r19743:

• avoid clash between bits used for ViewAdaptor.BOUND_ROLE and JavaElementImageDescriptor.OVERRIDES
• make decoration configurable via preference (see also #220).

[stephan]

Screenshot of corrected feature (no longer shows "implements" decoration)