Store functions in optimized TexlFunctionSet<TexlFunction> object
instead of IEnumerable<TextFunction>
Benchmark results
- -61% for Check N=1
- -77% for Check N=5
- -79% for Check N=10
- -42% for Eval N=1
- -65% for Eval N=5
- -67% for Eval N=10
Negligible improvement for Parse , Tokenize or PVA* benchmarks