key conflict popup

A better way to handle the key conflicts is to popup a list of all commands mapped to the same shortcut and let the user choose which command they want to execute (instead of ST executing one by default and ignoring the rest). Often times new packages introduce key conflicts and it's rather inconvenient for the user to have to re-map the conflicting shortkeys. It's likely that multiple operations sharing a shortkey are all useful thus necessary to be kept by resolving the key conflicts, which requires a careful remapping of these operations in order to avoid introducing further conflicts with yet other operations. IMO the key conflict resolution task should be handled by ST instead of being left up to the user.