Kebab cased identifiers

[orenelbaum]

Inspired by Coco, the idea is that identifiers can have hyphens, and they compile to camel case to preserve compatibility with external code that uses camel case.
This will be incompatible with TS since binary - operator will have to be spaced. Like x => y, it could be handled with a prettier.

[shurko0x4cfd]

I love kebab case.