Present a version of JAXP to use as an endorsed library

With JBoss Modules 1.1, the "jaxpmodule" facility has been eliminated. Instead we will take a simpler approach: simply endorse a JAXP API family of our own.

The following tasks are required:

1. Provide a full JAXP implementation which covers all JAXP APIs
2. Add a method or methods to these APIs which either:
   • allow the default provider for each API to be specified
   • allow a selector object for each API to be specified, which returns the appropriate implementation on request
3. Modify AS startup to include these JARs in the endorsed path
4. Modify the AS JAXP API modules to filter through to the system class path instead of packaging the JARs as modules
5. Remove said packaging from build.xml
6. Remove the AS JAXP implementation modules from build.xml and the build module repository