msp: fix imu struct signs.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: checksumming overhaul.

Use uint8_t; printf fixup.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: prettify msp_hdr field types.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: add array_size macro

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: host from/to le endianness conversions.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: fix header bracket.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: add altitude command.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: add attitude command.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: add mag-calibration command.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: add acc-calibration command.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: add eeprom-write command.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: add reset-conf command.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>
msp: minor usage fixup.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>