Add compatibility feature

[gerw]

This adds the suggestion of #168.

The test cases detect if

• a new parameter/calculation/visibility is added, and it also has to be added to the test suite (to make sure that the name is preserved in the future)
• a name has changed.

For obsoleted names, an error is thrown. I am not sure about the test case which checks for the error, because this means that the ID of the obsolete item has to be added to compatibilities.py and to the test suite.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
luxtronik
__init__.py	181	131	28%	39–51, 73–77, 80, 84–89, 93–97, 108–111, 119–121, 128–130, 137–139, 146–148, 157, 165–167, 170–173, 176–179, 182–198, 201–215, 218–234, 237–251, 255–257, 261–262, 266–267, 278–280, 283, 286, 289, 292, 295–298, 301–304
__main__.py	21	21	0%	3–49
datatypes.py	275	1	99%	82
discover.py	40	34	15%	21–69
luxtronik/scripts
dump_changes.py	44	44	0%	5–85
dump_luxtronik.py	27	27	0%	5–52
TOTAL	684	258	62%

Tests	Skipped	Failures	Errors	Time
123	0 💤	0 ❌	0 🔥	0.986s ⏱️

[kbabioch]

Should we log / raise a warning in case you're using an "old" name?