orbit-claws icon set for claws-mail

This set is an adaptation of Chris Neale's Orbit 3+1 theme for Mozilla and Claws
Mail's default icon set. Orbit 3+1, in turn, derives its various parts from Kent
Thuresson's original Orbit (Orbit Retro) and Orbit 3 themes.

In case you still haven't figured it out, this effort is more an indication of
my enthusiasm to contribute something to a program which i like rather than a
measure of talent. :)

subash
