simple foreign relations support

src/components/MapView.vue

src/components/helpers/TimeRangeInput.vue

src/components/subcomponents/map/AttributeSelector.vue

src/components/subcomponents/map/InlineColumnMapper.vue

src/components/subcomponents/map/PresetMenu.vue

src/components/subcomponents/map/RelationsColumnMapper.vue

src/components/subcomponents/transform/AdvancedRaw.vue

src/components/subcomponents/transform/CreateVirtualView.vue

src/components/subcomponents/transform/TimeFilter.vue

src/services/mappingUtils.ts

src/services/preset-definitions/synthetic-preset.json

src/services/utils.ts