Bugfix: FSS Extended read fails to handle non-terminated quote as per specification.

Bugfix: FSS Extended read fails to handle non-terminated quote as per specification.

This is a follow up to the problems discovered while writing unit tests and referenced in this commit: 70cbbe34121dc5679961df711e70724f13104489.

Given the line:
  a " b c d.

The following Content should now be returned:
  [0] = "
  [1] = b
  [2] = c
  [3] = d.

This adds a new FSS state flag 'f_fss_state_quote_not_e' to give the caller the ability to manually designate that the quotes are being disabled.
Currently only the FSS Extended utilizes this flag.

Refactor the private function private_fl_fss_basic_read() into private_fl_fss_basic_or_extended_read() to make it more explicitly clear that it provides functionality fo both FSS Basic and FSS Extended.

This changes to the code such that when an unterminated quote is detected then the calling function will set the disable quote flag and then call the function again.

The relevant FSS Extended unit tests are updated.