Adds Meyar's , Serithi's and Ikky's items

Adds 3 approved custom items.
http://baystation12.net/forums/viewtopic.php?f=33&t=9776
http://baystation12.net/forums/viewtopic.php?f=33&t=10197
http://baystation12.net/forums/viewtopic.php?f=33&t=10265
Fixed paths

Woops.
Primitive mask icon_state fix

Why so up?
Removed reappearing icon_state

Alright, I think this PR is finally fixed.
Adds 50_n00b's approved custom item.

Alright, this one shouldn't have any issues.
Adds Serveris's custom item

http://baystation12.net/forums/viewtopic.php?f=33&t=9992
Adds secret's approved custom item

http://baystation12.net/forums/viewtopic.php?f=33&t=10398
Merge pull request #5014 from Jarcolr/customitems

Adds *6* approved custom items to code