feat(shelter): add Other material and other format in BOQ

 Enable selection of “other” material formats (unit=kg)
 	thereby providing greater flexibility for recording non-standard materials
	— form as other unit should be kg/// have a look into it

 Enable selection of "Other" material.
 	If the correct material isn't there, user can select "other".

 User must then define the name of the material.
 User must enter the kgCO2e/kg (instead of referencing database).
 Add note stating that if kgCO2e/kg not entered,
     then material excluded from environmental impact calculations.
 User must enter kg of material.