Core: Apply const to some functions
Merge pull request #783 from lioncash/consts

Core: Apply const to some functions
Added cellNetCtlNetStartDialogLoadAsync and cellNetCtlNetStartDialogUnloadAsync
Merge pull request #784 from tambry/cellNetCtlNetStart

Added cellNetCtlNetStartDialogLoadAsync and cellNetCtlNetStartDialogUnloadAsync
Resolved merge conflicts