Improve ambiguous import error message

[lukaszsamson]

Before this PR, the message was referring to function even if macro was conflicting

function ~ts/~B imported from both ~ts and ~ts, call is ambiguous

[josevalim]

I think we can simplify the message instead, saying: duplicate foo/e import from modules Foo and Bar, wdyt?

[lukaszsamson]

I think we can simplify the message instead, saying: duplicate foo/e import from modules Foo and Bar, wdyt?

Less complexity but less precise message. I'd use the word "conflicting"

[josevalim]

I like conflicting!

[lukaszsamson]

Feedback addressed

[whatyouhide]

Lovely

[josevalim]

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