[Refactoring] Rename variables for ScopeDsymbol to `sds`
fix Issue 12746 - Wrong overload access within manually aliased eponymous function template
Merge pull request #3548 from 9rnsr/refactor_sds

[Refactoring] Rename variables for ScopeDsymbol to `sds`
Merge pull request #3549 from 9rnsr/fix12746

Issue 12746 - Wrong overload access within manually aliased eponymous function template
fix Issue 11042 - Inconsistent "static condition" behaviors

Divide `SCOPEcondition` and `SCOPEconstraint` properly.