* Prevent crash on pragma templates w/ generics
* Remove incorrect call to pragma reconversion
`semOverloadedCall` may return a node with more elements than the
original nkCall node had (implicit and/or explicit generics).
* Misc cleanup in macro code
Generate error messages using `error` instead of `assert`.
Fixes#10574
* Fix crash with hasCustomPragma on quoted fields
Use the `$` operator instead of reaching for the `strVal` field directly
* add custom pragma support for var and let symbols
* updated changelog for custom pragmas on var and let symbols
* add oldast switch for backwards compatibility
