Image name preferences for still pictures (img_name.mo, was filepref.mo)

[a1ex]

Following this request, I've decided to revive the old filepref module. Renamed it to img_name.mo.

Features:
- custom image file prefix (IMG_1234.JPG -> ABCD1234.JPG; from the old filepref module)
- change image file number to any value (IMG_1234.JPG -> IMG_5678.JPG; experimental, restart required)

TODO:
- timestamped file names (original request). Please don't expect it anytime soon - I don't know how to change the file number (last 4 characters) without restart. Maybe you can figure it out?
- date-stamped file names? (MMDD1234). This one might be easier; still need to find out how to reset the counter.
- continuous numbering? (12349999 -> 12350000, ABCD9999 -> ABCE0000). This one should be easy.
- customize folder number? (didn't try, but noticed the property in QEMU).

Known/possible issues:
- on 5D3, Canon file naming options must be set to default.
- might conflict with Dual ISO custom file naming (not tested).
- only tested on 5D3 and 60D.

Related:
- Image file prefix is also available to Lua (lua_fix builds)

Source: https://bitbucket.org/hudson/magic-lantern/src/img_name/modules/img_name
Binary: https://builds.magiclantern.fm/modules.html#img_name (only the first feature works; the second one requires a custom ML build)

[kichetof]

Yeah thanks for that! Glad to see some great stuff for photographers!    i'm excited to test (most probably during the coming days)

[DeafEyeJedi]

Wow this is actually really useful and will be nice to have. Can't wait to get my hands on this one!