Make load button on savesources overwrite existing coredatalake rather than merg...

Add something that automatically credits non-acenturyandabit contributors

https://api.github.com/acenturyandabit/workflowish/blob/1b9c4c25989dfdfc2d9589b8542fa01c12d445fe/docs/roadmap.md#L27

```markdown

# Version 3.1
`The symlink version`
- [ ] TODO: Add Symlinks
- [ ] TODO: Allow scripting engine to arbitrarily add and delete items; and create symlinks.
- [ ] TODO: Move Workflowy global out of scripting engine

# Version 3.2
`The multifile version`
- [ ] TODO: [FIX] load button in file dialog actually merges with data lake not overwrites
- [ ] TODO: Add an open different files dialog
- [ ] TODO: Load configurations from query path, which inform file loading
- [ ] TODO: Recent documents should show on open file menu
- [ ] TODO: Visiting site with blank URL should show open file dialog

# Version 3.2.1
- [ ] TODO: Upgrade README screenshot to gif
- [ ] TODO: better password entry dialog
- [ ] TODO: Check up on feature documentation
- [ ] TODO: Visiting site with blank URL should load last opened document
- [ ] TODO: Little popup from savesources to give user extra peace of mind when ctrl-s is pressed
- [ ] TODO: Alt + Enter will split a line down with the remaining text after the caret. Alt + Shift + Enter will make it a child.
- [ ] TODO: Pressing Enter will either insert an item before OR after the current element, based on the current caret index (front or back)
- [ ] TODO: Scripting: Add a console
- [ ] TODO: Warn if unsaved before closing
- [ ] TODO: Make Help dialog use the firstTimeDocument

- [ ] TODO: Make load button on savesources overwrite existing coredatalake rather than merge
- Allow appending imports in the text importer with a sync button, to allow incremental addition of items

# Version 4.0
- [ ] TODO: Extract MVC interface from ScriptingEngine / Workflowish into a template
- [ ] TODO: Add something that automatically credits non-acenturyandabit contributors

# Noncritical technical debt
- [ ] TODO: Create a github release flow of the built frontend only
- [ ] TODO: Refactor KVStores so it acts like CoreDataLake in terms of the 'changed' flag
- [ ] TODO: Refactor TextImportKVStore so that it doesn't use dirty this.settings hacks
- [ ] TODO: Remove the notion of 'id' from items; replace with key
- [ ] TODO: Fix mobile bug where on load, Enter key doesn't work because setFocusedActionReceiver is undefined

# Unroadmapped features
- [ ] TODO: Better (hidden) password prompt
- [ ] TODO: Create a SetInterval implementation for the ScriptRunner
- [ ] TODO: [devops] Create config-fold-check to fold config files
- [ ] TODO: [devops] Add structural readability checker
- Main functions should go first.

```