Vertical metrics tests

In these tests, line-height is set explicitly to 1.2.

|The quick brown fox jumps over the lazy dog.
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This font has all zero offsets: bbox 835/177, nominal 820/180.
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This font has hhead line gap set to 500.
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This font has typo line gap set to 500.
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This font has winascent/descent set to 1500/500.
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This font has winascent/descent set to 835/1000.
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This font has typoascent/descent set to 1500/500.
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Same as above, but "really use typo" flag on.
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This font has typoascent/descent set to 820/1000.
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This font has hheaascent/descent set to 1500/500.
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This font has hheaascent/descent set to 835/1000.
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This is Arial.
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