[locationinfo] Parametrize panel type configuration

Avoids a lot of copy and paste and duplicate work in php and html
part, for example explicitly handling every config variable for
a specific panel when displaying the config dialog, when saving the
config, and when loading the config for displaying the panel.

This also parametrizes enums, limits and ranges, so dropdowns
can be rendered automatically, validity of selected option can
be checked, and putting numeric settings into bounds all happens
generically.

Edit dialog for DEFAULT panel is still completely custom, as it has
too much special sauce going on with the room config overrides.
URL-panel is half-half, but SUMMARY and UPCOMING are entirely generic
now.

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