Updated submodule and config for SDIO fix

Implemented SK450 DeadCat frame support

remove/unset startup script variables

Added mixer check to set MAV_TYPE correctly

Lowered the pwm min

Implemented the way to specify motor output scale which is required for SK450 DeadCat as it has asymetrical arms (front arms are longer than back ones)

Fix invalid set of the variable

Changed naming of the mixers to get rid of umbiguity as outputs are actually going to be driven by io, not fmu
Implemented automatic lookup for the .aux.mix file if it exists

GPS driver: Add missing wall clock setup for MTK GPS modules

Adding a new base class to remove a lot of boilerplate code, no
functionality changes

Move all unittests to cmake

Multitables script fixes

The script still works with python2, I also added a file ending

Multitables v3