[enhancement] shebang support in lobster scripts

[minimoli]

i reckon that adding shebangs to lobster would make the whole experience just a little easier. a shebang (for those who don't know) is a line at the start of a script pointing the shell to where the interpreter is (#! path_to_interpreter [args]). currently, if you try to add a shebang to your script, you get an error looking like this:

hello_world.lobster(1): error: illegal token: '#'

i feel like this would enhance the development experience a lot.

[aardappel]

Here you go: https://github.com/aardappel/lobster/commit/3d3321c048fec8910a6b3dd9637c2acd8a577578

[minimoli]

thank you!