MAVLink XML change to allow exponentiation operator in bitmask flag

[hamishwillee]

FYI We're modifying the MAVLink XSD validation file in ArduPilot/pymavlink#920 to allow a bitmask value to be declared using the Python exponentiation operator.

This makes it easier to immediately visualize which bit is set by a flag, because you can use the syntax

<entry value="2**15" name="BIT15" />

rather than

<entry value="32768" name=" BIT15" />

This is transparent to mavgen because the parser evaluates the number before creating the generated headers. However it may affect other parsers.
We're not updating the XML yet to allow other parsers time to update.

Any concerns, please raise on ArduPilot/pymavlink#920

[aler9]

Hello Hamish, thanks for reporting the update and for taking into consideration the effects on this library.

I've updated the library and its unit tests in order to support all enum formats listed inside the PR you mentioned.

[hamishwillee]

THanks @aler9 . As an aside, this has been and interesting exercise in working out which libraries are most active :-)

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