Merge matching resources params maps

This allows setting default params values in the more general resource matchers. I also allows override with more specific values if needed.

```toml
[[resources]]
src = "documents/photo_specs.pdf"
title = "Photo Specifications"
[resources.params]
ref = 90564687
icon = "photo"
[[resources]]
src = "documents/guide.pdf"
title = "Instruction Guide"
[resources.params]
ref = 90564568
[[resources]]
src = "documents/checklist.pdf"
title = "Document Checklist"
[resources.params]
ref = 90564572
[[resources]]
src = "documents/payment.docx"
title = "Proof of Payment"
[[resources]]
src = "documents/*.pdf"
title = "PDF file"
[resources.params]
icon = "pdf"
[[resources]]
src = "documents/*.docx"
title = "Word document"
[resources.params]
icon = "word"

```

In the above `TOML` example, `photo_specs.pdf` will get the `photo` icon, the other pdf files will get the default `pdf` icon.

Note that in the example above, the order matters: It will take the first value for a given params key, title or name that it finds.

Fixes #4315

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