F map marker color config

Summary

Minimal enhancement to make the marker colors configurable (for the entities on the map) as requested per caosdb/customers/leibniz-zmt/management#127

Focus

Leaflet has a particular data structure (DivIcon_options) for the configuration of the map markers. We just use that and read it out from the config.

Test Environment

Use a normal map.json configuration and merge it with

{
    "entityLayers": {
        "current_page_entities": {
            "icon_options": {
                "html": "<i class=\"bi-geo-alt-fill\"  style=\"font-size: 20px; color: teal;\"></i>"
            }
        },
        "all_map_entities": {
            "icon_options": {
                "html": "<i class=\"bi-geo-alt-fill\"  style=\"font-size: 20px; color: brown;\"></i>"
            }
        }
    }
}  

You should now see the icons in brown and teal, instead of red and blue.

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• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
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assigned to @timm

changed the description

marked this merge request as draft

added 6 commits

• 48356eaf...89baf6a7 - 5 commits from branch dev
• e1ad970f - Merge branch 'dev' into f-map-marker-color-config

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added 1 commit

• 5383daa2 - DOC: configuration of entityLayers

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changed the description

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• bc199886 - DOC: Update CHANGELOG

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marked the checklist item All automated tests pass as completed

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marked the checklist item Up-to-date CHANGELOG.md (or not necessary) as completed

marked the checklist item Annotations in code (Gitlab comments) as completed

requested review from @florian

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marked the checklist item I understand the intent of this MR as completed

marked the checklist item All automated tests pass as completed

marked the checklist item Up-to-date CHANGELOG.md (or not necessary) as completed