Icons for new profile

Existing dummy icons are replaced with new ones for:
- o2 graph
- n2 graph
- He graph
- MOD
- EAD, EED, END
- DC reported ceiling
- calculated ceiling
- calculated ceiling in 3m increments
- SAC
- ruler

Fixes #446

Signed-off-by: Andrey Zhdanov <andrjufka@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Strip incorrect iCCP profiles from new icons

simply run
convert <name>.png -strip <name>.png

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>