Lens info fix
Created originally on Bitbucket by g3gg0 (Georg Hofstetter)
- fixed lens ID reading, added version etc. to be tested
- check for property length and decide if this feature is availablethis
as reported in http://www.magiclantern.fm/forum/index.php?topic=18083.msg175588#msg175588 the lens_id was read wrong. this was fixed here and added a display menu including reading of the other known fields.
this was confirmed for 5D3 and should also match for 600D and 7D. please report in if it doesnt match to others.