Why:
* We want to selectively apply expansion to:
* Only options from stowrc files.
* Only options that take a path.
* This requires ability to:
* Differentiate cli options from stowrc options
* Distinguish between individual stowrc options.
This change addresses the need by:
* Options from ARGV and stowrc files are separately parsed, resulting in
two options hashes.
* Creating an option hash from stowrc files allows modification of
specific arguments without having to rely on something like regex
parsing of the options.
* get_config_file_options modified to return options hash.
* Uses the same parse_options function that parses ARGV
* Add Hash:Merge to dependencies in order to merge the two option
hashes.
* process_options() merges the two option hashes.
* Get option hash for ARGV
* Get option hash from get_config_file_options().
* Merge the two hashes with Hash::Merge.
* Sanitation and checks are ran on the merged options.
* The options -S, -D, and -R are ignored in stowrc files.
* Due to the way argument parsing happens, the effect of these
actions is not carried from stowrc into parsing of cli options.
* It doesn't seem to make sense to put these options in stowrc
anyway.
