Offer more options for auto-populating menu layouts

[intvsteve]

Presently, there are only two options when automatically populating the menu layout:

1. Don't do anything
2. Preserve file system layout

Several other options could be added - meaning this should be broken into separate features per option

• Flat list
  • limitations due to target file system will apply, e.g. LTO Flash! or CuttleCart 3
• Create folders based on first character
  • Implies need to deal with common text sorting issue of 'A' and 'The' etc. which would be widely useful anyway
• Select auto-create of folders based on ROM metadata, such as publisher, network, year, et. al.
  • Many (most) modern ROMs do not presently populate the metadata fields that are available
  • Original-run ROMs can rely on the 'well-known checksums' database already in the code

An option to prompt per file will NOT be considered. :P