Add NEON filetype support

Is it possible to add the NEON filetype support into Weblate? NEON format is very similar like YAML, but there are some very small differences. The most important difference is, that translated string is between double quotes. NEON translation file format is using in NETTE Framework.

More information:
Nette Framework: https://nette.org/
...about NEON: https://doc.nette.org/en/3.0/neon
...more about NEON: https://www.tomasvotruba.cz/blog/2018/03/12/neon-vs-yaml-and-how-to-migrate-between-them/