options: stringshare, list clear bug fix
options: stringshare, list clear bug fix

1. _backgroundlist was not clear after free
2. _system_path was not clear after stringshare_del
3. various style prob.

@fix

ihorlaitan/terminology,ihorlaitan/terminology,bssb/terminology,bssb/terminology,godfath3r/terminology,godfath3r/terminology,godfath3r/terminology,ihorlaitan/terminology,bssb/terminology