Apply directives to the closest context instead of to subsequent code

### Prerequisites

- [X] This improvement has not already been suggested.
- [X] This improvement would be generally useful, not specific to my code or setup.

### Engine area

Delphi language support

### Improvement description

Currently, SonarDelphi "applies" a compiler directive when it is encountered. In Delphi, however, a compiler directive is applied at the beginning of whatever context it is in (which is not well defined). For example, the following prints "1":

```delphi
S := '01';
WriteLn(S[1 {$ZEROBASEDSTRINGS ON}]);
```

### Rationale

SonarDelphi is handling Delphi's semantics incorrectly.