Add "derived" G_TREND24.dec parameters as pseudo-msids

[aarvai]

Several PCAD and thermal msids have already been converted, but others are still missing. Some may be OBE though.

@matthewdahmer

[taldcroft]

@aarvai @matthewdahmer - was this addressed by #87?

[aarvai]

No, it's still an open action to each subsystem engineer.