Use fetch events in parsers for events that are not related to parsing and are related to getting the content of the file

[alrra]

Parsers currently have custom parse events for some actions that can be covered by fetch events.

For example instead of events like parse::<something>::error::not-found or parse::<something>::error::not-specified, we can just have fetch::missing::<something>.

In general I think the following events should cover most cases.

• fetch::end::<resource-type>
• fetch::error::<resource-type>
• fetch::missing::<resource-type>
• fetch::start::<resource-type>

I think having this (or adding these events in parsers) will not only reduce the need to introduce new custom events, and thus, new types, but also make more rules possible and easier to implement.

Also, in some cases as with the web app manifest, it will make things backward compatible with what we have right now

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See also: #930

[alrra]

This is now fixed.