refactor: WildFire::getBurnOrgSoilthick...
refactor: WildFire::getBurnOrgSoilthick...

rename some variables for clarity, re-organize function,
modify comments, formatting.

tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem