ControlCommand can repeat in a single ST0601 LS.

[bradh]

Describe the bug
ST0601 allows a small number of tags to repeat (see MUL column in Table 1). We don't currently implement any of those though, except for ControlCommand (Tag 115). That will get overwritten in the current parsing approach.

To Reproduce
Steps to reproduce the behavior:
This would require special test data to reproduce. I don't yet have any.

Expected behavior
We'd need to think harder about the change. Possibly a multimap would help.

Screenshots
N/A

Configuration (please complete the following information):
N/A.

Additional context
None at this stage.