Please support other units #286
Description
Is your feature request related to a problem? Please describe.
I not-infrequently work on architectural models which, as I reside in the US, I like to set up with 1 BU = 1 in. MPFB does not support these scales.
Describe the solution you'd like
Please add options for Imperial unit scales, 1 BU = 1 ft and 1 BU = 1 in. Please also consider adding an option to specify a custom scale, and an option to use the scene's unit scale. The latter in particular seems like it is TRTTD in almost all cases, and would significantly reduce the need to specify scale at all.
Describe alternatives you've considered
The only alternative seems to be to manually scale the object(s) after creation.