- Added new function function_updateDepend needed by runtime

  - Just a copy of function_updateDependents (for now)
- Implemented basic infrastructure for external functions


git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@4754 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

Author: Rickard Lindberg