Add a snipOrCopy CLI command

[dacharyc]

For a new use case, we would like to have Bluehawk operate on an input directory and take some action for every file in that input directory. If it has Bluehawk tags, we would like it to snip the file. If it does not have Bluehawk tags, we would like it to copy the file. (i.e. in the case of json where we cannot add Bluehawk tags, but we still want the file to copy to the output directory.)

This command should respect the ignore flag - i.e. we only want to take actions on files in non-ignored directories.

[cbullinger]

Don't want to overcomplicate things, but we already have a use case for snip and copy. Possible options:

• the proposed snipOrCopy has a flag to indicate that input files can be snipped and copied
• the proposed snipOrCopy does as described above, and a different snipAndCopy command supports performing snip on applicable files and copy on applicable files

The other consideration is that copy does not use the same naming format as snip. Might be useful to support standardized naming for copied files in this instance or formatting options for the outputted filenames