add benz submodule
delete old submodules
remove include headers
initial benz integration
move main.c to src/
managed to make it work
update benz
update prototypes (picrin/symbol.scm, picrin/list.scm, picrin/base.scm)
add scheme/read.scm and scheme/write.scm
rewrite load.c
addictional argument for pic_open
remove scheme implemetation of identifier=?
refactor define-record-writer
reorder base.scm
update benz
move define-record-type
move core syntaxes
WIP
more fixes
update benz