[MAINT] Removed unused Language Aliases

[gnikit]

Remove unused language aliases and add tags. Also, need to change the language alias Fortran from Fixed Form to Free Form. Changes that need to be made are as follows:

Language Aliases

Removed

• FORTRAN77
• fortran_fixed-form

Changed

• Fortran: to F90 from F77. Is now the primary alias for FreeForm
• Fortran77: default alias for FixedForm

Keywords

Added

• Modern Fortran
• fortls
• fpm

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This will cause breaking changes to anyone using the aliases instead of the language IDs. We will keep Fortran90 as an alias for FortranFreeForm to keep things consistent with fortls.

[nassaralnassar1]

Thank you