Problem: filetype: support for Intel HEX files is lacking
Solution: Add more file extensions that are typical for Intel HEX files
(Wu, Zhenyu)
Reference: https://en.wikipedia.org/wiki/Intel_HEXcloses: #14355
Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>