Define matching rule "none" in the base FMI standard

[chrbertsch]

providing a matching rule is mandatory, see
There might be use cases where one does not want one of the predefined matching rules to be applied, see modelica/fmi-ls-struct#8

[chrbertsch]

FMI Webmeeting:

Christian: Could this be defined in 3.0.2?
KLaus: could be done technically, but does not sound like a bugfix.

[chrbertsch]

Pierre: I could live with this in 3.0.2. We are not really defining something new.
Klaus: It is a non-breaking change to make matching rule optional.
Pierrre: "none" is more than "do whatever you want", because it discourages doing something.
Klaus: the FMU tells "I do not know anything about matching".
Pierre: Could be the FMU/ layered standard author.
Klaus: "none" is undefined, "don't" would tell not to match.
Pierre: "none": for me means: do no automatic matching, "undefined": do whatever you want.
Klaus: in FMI-LS-STRUCT we defined a specific matching rule

Poll:
Do we want to add a new matching rule at all?
Yes: Pierre, Christian, Otto, Garron, Jan, Daniel
No: -
Abstain: Rest

Do we want as new matching rules:

• "none" only ("the creator of the FMU does not intend automatic matching", under user direction the tool can do whatever it pleases): Nikolai, Kharamon, Pierre, Garron, Jan, Klaus
• "none" and "undefined": Christian
• Abstain: Rest

Pierre: "none" would also be a good default