Rule for semicolon style

[Andrew Pennebaker]

Some languages like JavaScript have optional semicolons, which presents the opportunity for flame wars and merge conflict hell. Can we get a rule for specifying one's preferred semicolon style?

Values:

* none / <unconfigured> / don't care / ignore
* require trailing semicolons from statements
* require stripping trailing semicolons from statements

Of course, this rule may be more difficult to implement than some other rules, and only makes sense for certain kinds of ASTs. But we could get a head start declaring the rule, and let plugins do their thing over time.

[Caleb Maclennan]

I would support this. Even if not all editors could support it some
could and it's worth defining on a project level basis. EditorConfig
is the natural place to do that.

Note many linters already support this rule, and some editors surface
warnings from such linters, but I think it still makes sense to have
an editor agnostic spec for this.

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