add pic_try/pic_catch macros
add pic_try/pic_catch macros

leavesbnw/picrin,ktakashi/picrin,ktakashi/picrin,omasanori/picrin,koba-e964/picrin,dcurrie/picrin,picrin-scheme/picrin,koba-e964/picrin,dcurrie/picrin,leavesbnw/picrin,ktakashi/picrin,omasanori/picrin,picrin-scheme/picrin,leavesbnw/picrin,koba-e964/picrin