Added missing Fortran 2003/8 keywords/intrinsics.
Added missing Fortran 2003/8 keywords/intrinsics.

Modelled after https://github.com/geany/geany/commit/05dda6b001ac71d0fc8592f480e30b8a52e2def5 which I submitted to Geany earlier this year.

Source: "Modern Fortran Explained" by Metcalf

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