[w3c/uievents] Add missing IDL parameters for init*Event methods (#300)

This reflects what the corresponding phrases describe. Some whitespace changes are included to fix tab/space inconsistency.

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec/BikeShed errors or warnings.
 * [x] Modified Web platform tests (link to pull request): This doesn't introduce any behavior change.

Implementation commitment: (All engines already implement them)

 * [x] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
 * [x] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [x] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/uievents/pull/300

-- Commit Summary --

  * Add missing IDL parameters for init*Event methods

-- File Changes --

    M .gitignore (1)
    M sections/legacy-event-initializers.txt (48)
    M sections/legacy-event-types.txt (111)

-- Patch Links --

https://github.com/w3c/uievents/pull/300.patch
https://github.com/w3c/uievents/pull/300.diff

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