C2MS12 — Use Semantic Versioning for Version Number of Messages

This is one for C2MS 2.0. Capturing it here, because this is the only avenue to enter issues at present.

Instead of a F32 for version number, which then uses a year, like 2024.0, we should change this to a formatted string that uses Semantic Versioning, with a string that looks like the following:

MAJOR.MINOR.PATCH

Examples: "2.0.0", "2.1.1"

Note that this means changing the base type and the meaning of the current version numbers.

Note, too, that this shouldn't simply be type STRING, but should be something like VERSION-STR with the format defined by C2MS.

Also, consider getting rid of the separate header version and message content version. This is just something to bring up to the group.