Attitude Logging (ANG)

[andyp1per]

Introduces a new high rate attitude message - ANG - to replace the use of ATT for the attitude controller.

[peterbarker]

Perhaps a test to make sure ATT.DesRoll and ANG.DesRoll match in normal operation

Could use

        dfreader = self.dfreader_for_current_onboard_log()

[andyp1per]

Here is a log from a quadplane mission 00000002.zip

[andyp1per]

Tested on my 5"

[rmackay9]

I guess I wasn't involved in the review of this (probably my fault for not paying attention) but I think it's a bit odd that we now have both ATT and ANG messages with nearly exactly the same information in them. It's hard to imagine what argument would not allow increasing the rate of the ATT message but would allow a duplicate message