[Editor] Organized lists for background and music choosing

[Alucard648]

One thing that legacy SMBX editor has, but any superior editors lack is organization of background and music lists. In that editor the available backgrounds list can be filtered by category (SMB1, SMB2 etc.) In the latest SMBX38A 1.4.4, as well as PGE editor all available backgrounds are thrown into one giant list to choose from. Same issue with built-in music. I wish there will be an option and setting for categorizing background and music to avoid having to scroll down through 1000+ entries to choose one.

[Wohlstand]

That wants a separated pop-up dialog box make it work same as menu (show, let use do coose, and cloae when user sets focus to something other) where search filters are will be.