[spec] Update
[spec] Update

- Add object literal
- Update range types
- Update closure expression
- Update parameter declaration syntax
- Remove "func" from function types
- Make tuple-unpack-statement variable-list more restricted
- Update optional type syntax to use '?'
- Fix typoed greater-than-or-equal symbol
- Remove defer-statement restrictions
- Disallow subscripting array pointers
- Allow pointer arithmetic with `.offset(int64)` method

[ci skip]

emlai/delta,emlai/delta,delta-lang/delta,emlai/delta,delta-lang/delta,delta-lang/delta,emlai/delta,delta-lang/delta