Shifter: Foot component: Have some orientation limitations

[miquelcampos]

From @miquelcampos on April 11, 2018 14:8

At this time,
we have to model certain limbs at fixed orientaons
as far as legs goes and such,
otherwise the foot roll solvers will be slanted and FKs's not oriented to they would be expected
to be. We cannot generate a viable rig if someone has legs at any angle that is not aiming
directly at the go

Copied from original issue: mgear-dev/mgear_legacy#185