feat: excel import (#527)

* refactor: simplify excel import

* chore: add external deepmerge utility

* chore: create import map utilities

* chore: increase size limits on uploads

* style: small presentation tweaks

* feat: resolve times on excel import, refs #508

apps/client/src/common/components/input/colour-input/SwatchSelect.tsx

@@ -1,6 +1,6 @@
 import { useCallback } from 'react';
 
-import { TitleActions } from '../../../../features/event-editor/composite/EventEditorDataLeft';
+import { EditorUpdateFields } from '../../../../features/event-editor/EventEditor';
 
 import Swatch from './Swatch';
 
@@ -8,8 +8,8 @@ import style from './SwatchSelect.module.scss';
 
 interface ColourInputProps {
   value: string;
-  name: TitleActions;
-  handleChange: (newValue: TitleActions, name: string) => void;
+  name: EditorUpdateFields;
+  handleChange: (newValue: EditorUpdateFields, name: string) => void;
 }
 
 const colours = [