Move JTAG interface list to new files.

- Adds new source files to encapsulate static/dynamic module handling.
- Further work should implement the jtag_interface_modules_load routine,
  to populate the jtag_interfaces list from shared libraries in a path.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2413 b42882b7-edfa-0310-969c-e2dbd0fdcd60