update for new language-lua, continue implementing lua backend
WIP: continue implementing Lua backend
... implementing stuff
continue implementing stuff
fixing bugs and stuff
implement new stuff, remove old stuff
implement ConstructorBinder
implement ObjectBinder
suppress warnings and a bugfix
comment out runtime type checks for now
continue implementing features and fix some bugs
refactoring, move some functions to new modules
port Prelude for Lua backend
fix Lua prelude
change Lua backend option name
handle external declarations
add newlines to extern Lua code
use Lua prelude by default for now
fix a bug in code gen