zig fmt: canonicalize symbol names

[andrewrk]

Currently in Zig, it's legal to do this:

fn foo() {

}
fn bar() {
    @"foo"();
}

Or worse:

fn bar() {
    @"\x66\x6f\x6f"();
}

This is not grep friendly and it goes against One Way To Do Things. It would be nice if code readers could rely on all symbols being represented the same way.

Therefore I propose an error of the form:

error: non-canonical symbol: @"\x66\x6f\x6f". Use `foo` instead.

This also serves the goal of Prioritize Reading Code Over Writing It.

[andrewrk]

Original proposal rejected. Counter proposal accepted: canonicalize symbol names with zig fmt.