Add REST test for requesting entity with / in name

Bump version to 4.0.1

Fix incorrect @file headers

Update amalgamated files

Add CanToggle and Sparse traits to manual

v4

Change field index to start from 0

Fix issue where observer could access deleted id record during world …

…cleanup

#1082 Don't throw error when cloning entity with an entity name

Fix issue with pair components where relationship id is recycled