cost model inputs in keyfiles replaced with {{insert.cost_model_inputs}}

also adds cost_model_inputs.txt to include folder
updates {{insert.cost_model... to {{include.cost_model
replaces fire hazard rating in keyfiles with {{include.fire_hazard}}

also adds fire_hazard.txt to include folder
removes extraneous END after MISTOFF keyword in keyfiles
replaces spotted owl ratings in keyfiles with variant-specific {{include.var_spotted_owl}}

Also adds BM_spotted_owl.txt, CA_spotted_owl.txt, etc. for every variant
into include folder.