[Refactoring] Remove Scope::offset
Issue #6050 fix

https://issues.dlang.org/show_bug.cgi?id=6050

Group ID is now workarounded as it was done for `user_id`
Add Expression::extractLast
[Refactoring] Reduce memory allocation on comma translation in AssignExp
[Refactoring] Tweak extractOpDollarSideEffect
fix Issue 12585 - Segfault on lazy/catch/opIndex
[Refactoring] Simplify the code for DIP29
fix Issue 12467 - char[] is implicitly convertible to string
fix Issue 12403 - [AA] Associative array `get` function rejects some cases
fix Issue 12011 - "Internal Compiler Error: Null field" on CTFE method call on .init
Merge pull request #3466 from 9rnsr/fix12011

Issue 12011 - "Internal Compiler Error: Null field" on CTFE method call on .init
Merge pull request #3465 from 9rnsr/fix12403

[REG2.066a] Issue 12403 - [AA] Associative array `get` function rejects some cases
Merge pull request #3464 from 9rnsr/fix12585

[REG2.064] Issue 12585 - Segfault on lazy/catch/opIndex
Merge pull request #3462 from 9rnsr/refactor_offset

[Refactoring] Remove Scope::offset
Merge pull request #3463 from SSPkrolik/patch-1

Issue #6050 fix
Merge pull request #3461 from 9rnsr/fix12467

[REG2.066a] Issue 12467 - char[] is implicitly convertible to string