Refactoring semanticTiargs
fix Issue 9178 - UDA: getAttributes does not play well with tupleof
Refactoring semanticTiargs more

Standardize processing of tiarg - type, symbol, and expression.
Merge pull request #1505 from 9rnsr/refactor_tiargs

Refactor semanticTiargs() and fix Issue 9178 - UDA: getAttributes does not play well with tupleof