pre-commit trailing whitespace auto clean for XSL files (#469)

The trailing-whitespace hook now targets XSL files.

(cherry picked from commit faed12091a4d14a5fb23110a4a3a01634c3a4257)

pre-commit whitespace clean up for dtd files (#464)

Enforced 3 hooks for dtd files:

- end-of-file-fixer
- mixed-line-ending
- trailing-whitespace

(cherry picked from commit 04a2557ead4715ca75016f6

pre-commit whitespace clean up for dtd files (#464)

Enforced 3 hooks for dtd files:

- end-of-file-fixer
- mixed-line-ending
- trailing-whitespace

(cherry picked from commit 04a2557ead4715ca75016f6c4f710aff3e602143)

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