NGSI9 and NGSI10 decoupling

All unit_test and test harness working.

In addition, I have need to fix issue #47 to solve some harness tests (a rather important issue, by the way).

Although they are working, harness test should be revised in the future, as probably some steps doesn't make sense (e.g. it seems to be a lot of redundancy in operations, some probably need a better name, etc.). However, not critical in the context of this PR.