Now, if the content was loaded from a playlist, the content name will be the playlist entry's title instead of the filename of the content.
Also, `state` was modified to show the display name of the core, not the
library name. The difference is that the display name shows the platform
as well, not just the core name (i.e. "NEC - PC Engine SuperGrafx (Beetle SGX)" instead of "Mednafen SuperGrafx").