- this works around cygwin path issues on windows

The fix_type variable in ubx.cpp may be assigned to 4(DGPS) or 5(Float RTK) or 6(Fixed RTK). So if we use differential gps, the value of the fix_type variable may not be 3. But gps still has 3d data and gps time. So The name of the file should named with gps time.My ublox differential gps fix_type is 5 (Float RTK).

According to the board_config.h shown. bmm150 only on the external i2c bus

and make sure the vtol params are always initialized

This got lost in 4416c4dd

Make it clearer that the gate parameters control innovation consistency checks and that the gate size is specified in standard deviations.
Also make it clear that the EKF2_BARO_GATE also controls the GPS height fusion.

mc_pos_control: save previous velocity setpoint after constraining, fix smooth takeoff to be still excluded from slewrate

pylint format

quad_vtail: reverse prop direction (same quad_h) to combine yaw torque induced by propellers and yaw torque induced by tilted rotors.

Mixers: Use geometry of SK450 deadcat for both quad_wide (centered CG) and quad_deadcat (off-centered CG)

Mixers: add quad_x, quad_h, quad_plus

Mixers: add quad_deadcat

Set quad_deadcat.toml according to dimensions of SK450 deadcat

Mixers: add hex_x, hex_plus, hex_cox and hex_t

Mixers: add geoms octa_x, octa_plus, octa_cox

Mixers: add wide geoms

Mixers: add tri_y and twin_engine geoms

Mixers: add dodeca geoms

Mixers: Add geom quad_x_pusher

Mixers: List geom files in CMakeLists.txt

Mixers: add option to normalize like legacy script

Fix py2 compatibility

 - fixes #8257

See:

https://github.com/PX4/ecl/pull/350
https://github.com/PX4/ecl/pull/354

Note the amount of stack allocation has had to be increased to accomodate pr350