Adding AppendWhen overload for char
Adding AppendWhen overload for char

Ehryk/commandline,anthonylangsworth/commandline,anthonylangsworth/commandline,nausley/commandline,rmboggs/commandline,Thilas/commandline,huoxudong125/commandline,Thilas/commandline,huoxudong125/commandline,kshanafelt/commandline,Emergensys/commandline,Emergensys/commandline,kshanafelt/commandline,nausley/commandline,rmboggs/commandline,Ehryk/commandline