[Bug] Support for decimal qualifiers 'M' & 'm'

I run into a problem when I tried to evaluate an expression with a ```decimal``` value (eg ```"0.5m"```).
```ExpressionParser``` detects it as ```double```, then ```PromoteExpression``` method try to convert it to ```decimal``` but keeps qualifier 'm' as part of text, and ```decimal.TryParse("0.11m", out e)``` returns 0.