Proposal: #ModuleNameCharacters

[mark.reinhold at oracle.com]

2016/12/8 2:26:12 -0800, forax at univ-mlv.fr:
> 2016/12/7 15:40:17 -0800, mark.reinhold at oracle.com:
>> ...
>> 
>> To sum up: Reserve `:`, `@`, and `\` for future use, and forbid the ASCII
>> non-printing characters (< 0x20).
> 
> You also need to reserve '/' because the java launcher (-m) use '/' to
> separate between the module name and the main class.

No, that's just a launcher detail.  If this becomes a real problem
then we can work out a `/`-quoting mechanism for the launcher.

- Mark