GitLab

* Add `standalone` target for CApp makefile clients.

  This is analogous to `standalone` for CModule clients, and is implemented
  as an alias for the `all` target. This is useful because cppcheck CI jobs
  need a consistent way to ensure that all local autogenerated source and
  header files have been created, so that cppcheck can fully analyse the
  source code.

* Enable install target for cross-compiling CLibrary components.

  `install` was missing from the list of targets that need to be re-run from
  within the `objs` subdirectory.