this necessary when a regional preset (e.g. from NSI) is supposed to inherit fields from a parent preset, but the direct parent does NOT apply at the location of the entity to be added/edited. In that case we need to search for a potential regional variant of the parent preset.
* pressing return/enter doesn't deselect the entity anymore
* predefined ("static") field options are always listed in the combobox dropdown, even if taginfo doesn't include them (because of low usage)
* (raw) tag values can also be entered for localized strings
* static localized strings can be used before taginfo response is received (useful when taginfo is slow or unavailable)
* fixes some bugs which can be triggered when taginfo is slow
* fixes a bug where the autocomplete dropdown doesn't work properly when tags have "few" values
* multiCombo fields can be case-sensitive now
`renderDisclosureContent` in `preset_fields.js` tries to detect the geometry types of the selected entities, but the result is always `[]`.
Reason: The handler of `_entityIDs.reduce` always returns `true`. So the result of the `reduce` call is `true` as well. `Object.keys(true)` results in `[]`.
Fix: The handler of `_entityIDs.reduce` should return the map which collects the geometry types, so `geometries` will be be something like `["line", "vertex"]`.
Consolidate localization behavior and init to a coreLocalizer function and singleton
Explicitly support `en-US` locale
Rename coreData to coreFileFetcher and export a singleton rather than using a property of coreContext
Add `apiConnections` property of coreContext to simplify adding a source switcher
Replace some init functions with re-callable, promise-supporting `ensureLoaded` functions
Make coreContext itself load the UI if a container has been specified at init time
Fix code tests
