In fcl-passrc, TPasElement.GetDeclaration does not display label declarations
TPasElement.GetDeclaration does not display label declarations. This happens because
```function TPasLabels.GetDeclaration(full: Boolean): TPasTreeString;```
is not implemented.
For example, with the following program:
```
program Prog;
{$mode ObjFpc}
label
Label1, Label2;
begin
end.
```
It does not produce any output.
See attached zip archive to reproduce.
[test.zip](/uploads/af4616230a4e9c2bccbdf8440d1233c8/test.zip)
issue