p8tool listrawlua fails with AttributeError: 'list' object has no attribute 'split'
Using `p8tool listrawlua` or a normal .p8 cartridge (that would work with `listlua`) will output:

> Traceback (most recent call last):
>   File "/usr/local/bin/p8tool", line 8, in <module>
>     sys.exit(tool.main(sys.argv[1:]))
>   File "picotool-repo/pico8/tool.py", line 592, in main
>     return args.func(args)
>   File "picotool-repo/pico8/tool.py", line 195, in listrawlua
>     lua_lines = raw_lua.split(b'\n')
> AttributeError: 'list' object has no attribute 'split'

from the source code of `def listrawlua(args)` in `tool.py`, `raw_lua` is defined as either:

data = game.Game.get_raw_data_from_p8png_file(fh, fname)
`raw_lua = data.code`

data = game.Game.get_raw_data_from_p8_file(fh, fname)
`raw_lua = data.section_lines['lua']`

I'm working with a .p8 so it must go through the second case, but data.section_lines seems to contain a list of lines, not a string.
The seemingly obvious fix is to use the list of lines directly:
`lua_lines = raw_lua` (or just use raw_lua, but name is less clear)

However, that adds a newline after every line in the output. To get rid of this, remove `'\n'` in those lines:
```
util.write('{}: {}\n'.format(i, _as_friendly_string(l)))
util.write(_as_friendly_string(l) + '\n')
```

However, that may break the .p8.png case! I haven't tested that yet.
Maybe get_raw_data_from_p8_file needs to be adapted to remove the `'\n'`, or get_raw_data_from_p8png_file to add them, it remains to be seen.