[w3c/IndexedDB] open/deleteDatabase error events are cancelable in implementations (#164)

The spec defines the error events thrown from open() and deleteDatabase() with cancelable false, but implementations have this as true. Align the spec with reality.

Also:
* Make various overly detailed asides into details with summaries - for "why aren't the normal fire a success/error event steps used?", and to explain why the name and version getters are convoluted.
* Fix the autolinking for deleteIndex
* Flesh out the change history with recent big changes.

Tests: https://github.com/w3c/web-platform-tests/pull/5108
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/164

-- Commit Summary --

  * open/deleteDatabase error events are cancelable in implementations

-- File Changes --

    M index.bs (124)
    M index.html (467)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/164.patch
https://github.com/w3c/IndexedDB/pull/164.diff

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