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Add support for disk control interface v1 (disk display labels)

Libretro-Admin requested to merge github/fork/jdgleaver/extended-disk-control into master

Created by: jdgleaver

This PR adds support for libretro disk control interface v1 (c.f. https://github.com/libretro/RetroArch/pull/10019) - in particular, it enables the display of disk 'labels' when using RetroArch's Current Disk Index drop-down list to select disk images.

By default, disk labels are set to the image filename without extension - but when using M3U playlists custom labels may be set via the following syntax: DISK_FILE|DISK_LABEL. For example, this M3U file:

Valhalla & the Fortress of Eve_Disk1.adf|Game Disk
Valhalla & the Fortress of Eve_Disk2.adf|Data Disk
Valhalla & the Fortress of Eve_Disk3.adf|Level 1 Disk
Valhalla & the Fortress of Eve_Disk4.adf|Level 2 Disk
Valhalla & the Fortress of Eve_Disk5.adf|Level 3 Disk
Valhalla & the Fortress of Eve_Disk6.adf|Level 4 Disk

...will produce the following menu:

Screenshot_2020-01-17_14-39-34

If DISK_LABEL is intentionally left blank (i.e. DISK_FILE|) then only the disk index will be displayed.

Save disks generated by the #SAVEDISK: keyword are automatically assigned the label: SAVE DISK [SAVE_DISK_INDEX].

Here are some more examples:

HeroQuest - Return of the Witch Lord_Disk1.adf|HeroQuest
HeroQuest - Return of the Witch Lord_Disk2.adf|Expansion - Return of the Witch Lord
#SAVEDISK:
#SAVEDISK:

Screenshot_2020-01-17_14-48-39

Sensible Golf (1995)(Virgin)(Disk 1 of 2).adf
Sensible Golf (1995)(Virgin)(Disk 2 of 2).adf
#SAVEDISK:

Screenshot_2020-01-17_14-54-08

Secret of Monkey Island_Disk 1.adf|
Secret of Monkey Island_Disk 2.adf|
Secret of Monkey Island_Disk 3.adf|
Secret of Monkey Island_Disk 4.adf|
#SAVEDISK:

Screenshot_2020-01-17_17-37-30

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