[w3c/manifest] Export the "install" dfn for cross-spec linking (Issue #1211)

marcoscaceres created an issue (w3c/manifest#1211)

The `install` dfn (at [`#dfn-installed`](https://www.w3.org/TR/appmanifest/#dfn-installed)) is not exported, preventing other specifications from linking to it via cross-spec references.

Currently:
```html
<dfn data-local-lt="installing|installation" data-lt="installed">install</dfn>
```

This PR promotes `installing` and `installation` from `data-local-lt` to `data-lt` (making them exported aliases) and adds `class="export"` to make the dfn available for cross-spec linking.

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