move rSYMBOLs from pic_state to codegen_state
add sSYMBOLs to pic_state
add analyzer prototype
arena management
fix some bugs
typo
change lookup_var API
initialize with global scope
remove unused properties
add pic_list_ref
add pic_compile
increate gc header alignment size
add pic_list_ref and pic_list_tail
add pic_append
impl list-ref and list-tail as C functions
replace length/reverse/append impls with c functions
replace list impl by scheme with impl by C
replace cxxr and list? impls by scheme with ones by C
replace list-set! impl with C impl
reduce exports