Syrus Seto, Custom Item, Attempt two

Second pull request, as mistakes were made in the first one. Those
should be all fixed now. Feel free to drop a comment if anything is
still amiss.
___________________________________________________________________
Added in the icons and code for the retractable HUDshades. A bit of work
on behalf of Bay coders is requested for finer details (details in the
form of comments within item_defines.dm), however the code
itself is currently stable.