By default, tldraw's brushing mode will select when the box intersects
an shape's geometry. A user can hold Command / Ctrl to require that the
selection box fully contain a shape's bounds instead.
Some people really prefer the opposite. Three years! Three years I've
been saying "no no no".
This PR adds a user preference to flip the logic. When `isWrapMode` is
true, selection requires that the box completely contain a shape before
it's added to the list of selecting shapes; and ctrl flips back to
intersection instead.
### Change Type
- [x] `minor` — New feature
### Test Plan
1. Turn on wrap mode in the user preferences menu.
2. Select stuff.
3. Use the ctrl key to except the behavior back to intersection.
- [x] Unit Tests
### Release Notes
- Added `isWrapMode` to user preferences.
- Added Wrap Mode toggle to user preferences menu.
4f07e696e8