Unicode support

[gunnarx]

Placeholder for discussion on allowable characters in the YAML definitions.

• Today: Which are the allowable characters, for example in signal names (right now only letters, numbers and "." encoded in ASCII seems assumed)?
• Future: What are future rules taking into account non-english languages, as well as the general consensus in many programming environments to use unicode file formats (UTF8 would be a good small step of course).
• Also, make sure to compare to YAML specs so that the result is still YAML compliant.

[crea7or]

Since JSON and YAML are UTF-8 by default there are not so many choices.

[oliveirarleo]

Well, I think more support is good, but this may interfere with some things already defined, for example . and # are already reserve.

Another thing is that someone will be able to use emojis and other characters that may not be desirable.