function: use acs_upvalue to implement closures
compiler: initial commit
compiler: initial acs_compile_file()
compiler: add compile_block()
lxr: add function token
compiler: add initial compile_top()
machine: add BS_TRUE and BS_FALSE
compiler: add parsing basic literals: null, true, false
main: enable compiling
compiler: fix missing list initialization
compiler: fix missing consume() in compile_top()
compiler: consume ; after expression
compiler: return phony finstance on success
compiler: add perr() for parse errors