Progress: Continue working on completing the remove program.

Progress: Continue working on completing the remove program.

Add the `rmdir` program.

The `install.sh` script doesn't utilize the `-s` parameter.
There only needs to be a single `install.sh` command, which attempts to install everything in the build directory.

Update the version numbers to `0.7.1` just to make relating to the 0.7.x FLL more consistent and obvious.
Eventually these will separate and change in their own ways but for now this is not a problem as there is no official Kevux Tools release.

Change how the `--remember` logic works.
Skip the pre-process entirely if the remember matches.
Do not append a trailing slash for directories.
(There may need to be more code reviews due to the new remember logic and I will have to do this later.)
The `skip` printing in the simulation mode is no longer needed due to this change.

The `--empty` logic along with the `--ignore-fail-on-non-empty` is changed.
I need to rethink the design but for now just make the logic work for `--ignore-fail-on-non-empty`.
This allows for `rmdir` to work as expected with `--ignore-fail-on-non-empty` and without `--ignore-fail-on-non-empty`.

These changes break some of the unit tests.
The `--force` tests also started failing.
It looks like I didn't actually finish those tests and they happened to previously pass so I didn't notice that it is incomplete.
I will come back to these tests later to address them.