Allow comments not only to be at the beginning of a line.

[ikarus23]

Comments (lines starting with #) are allowed in key files. However the # must be at the beginning of a line. As an enhancement MCT should also support more comment formats.

# At the beginning of a line
FFFFFFFFFFFF# At the end of a line
FFFFFFFFFFFF        # Even whitespaces should be ignored.

This will make MCT compatible with key files from the Proxmark3 https://github.com/RfidResearchGroup/proxmark3/edit/master/client/dictionaries/mfc_default_keys.dic

[ikarus23]

Done with 75fc292.