refactor: use `getsym`/`setsym` over `getu`/`setu`#853

ChrisRackauckas merged 1 commit intoSciML:masterSciML/SciMLBase.jl:masterfrom

AayushSabharwal:as/getsetsymAayushSabharwal/SciMLBase.jl:as/getsetsymCopy head branch name to clipboard