Problem: filetype: zsh module files are not recognized
Solution: Detect '*.mdh' and '*.epro' as C filetype, '*.mdd' as zsh
filetype, determine zsh-modules '*.pro' from from it's content
(Wu, Zhenyu)
closes: #14737
Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>