* Moved read-only property and resolve methods from TaskContext to new Context
  interface.  TaskContext now extends the new Context interface.

* Changed the Configurer methods to use the new Context.  Both implementations
  use the supplied Context to do property resolution.

* Renamed TaskContext.getPropertys() -> getProperties().

* Moved PropertyUtil from configurer to workspace package, as that is now
  the only place it is used.

* Changed PropertyUtil to work with the new Context.

RoleManager:

* A default implementation for a role can now be specified.  Currently
  can only do this programatically.

DefaultMasterConverter:

* Removed MasterConverter interface.  It is now identified by the Converter
  role.

* Now caches the converter instances.

* Changed the converter search algorithm to traverse the *source* class
  hierarchy, including all interfaces.  Chooses the most specialised
  conversion, and fails if there is more than one such choice.

DefaultConfigurer:

* Attempts to convert references, if the type does not match the expected type.

* Changed handling of nested elements, for named adders/setters:
  * If the method type can be mapped to a role, and that role has a default
    implementation, then use that default implementation.
  * Otherwise, if the method type is an interface, fail.
  * Otherwise, create an instance using no-args constructor.

* Changed handling of nested elements, for typed adders/setters:
  * If the method type can be mapped to a role, and the element name is
    a type of that role, then use that role to create the instance.
  * Otherwise, use the type factory for the generic data-type role.
  * Attempt to convert the instance if it is not of the expected type.

* Added a bunch of test cases for new functionality.

* Renamed all the ConfigTest classes to have descriptive names.

Misc:

* Renamed package framework.factorys -> framework.factories.

* Made tests work when fork = false.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@271539 13f79535-47bb-0310-9956-ffa450edef68