Remove check on compiler directive starting before column 8 ?

[fm-117]

In CobolTextLine, when attempting to create the indicator area for the line, the parser checks for the presence of specific compiler directive keywords that may be written before column 8.

https://github.com/TypeCobolTeam/TypeCobol/blob/13ecd3bcc640d31b36ea84c7b0faa6bff63cd381/TypeCobol/Compiler/Text/CobolTextLine.cs#L304-L315

While those directives have been allowed in Cobol 2, it seems it is not relevant anymore for recent versions of Cobol so this check could be removed or simplified

• Test on IBM compiler for each mentionned directives
  • If the directive is not allowed before column 8, it should be removed from the list
  • We still need a specific check for *CBL / *CONTROL