pewpew -d crash (#99)

* Fixed an issue with out directories and stats file params

- new versions of Clap panic with invalid utf8 passed to value_of_os()
  - clap-rs/clap#3344

* Added comments to changes

* Added tests for the command line parser

- Split the parsing code into separate functions that can be tested
- Moved the logger init out of the match functions so we can test the cli parsing
- Added tests around the path checks. Found we weren't parsing the try -d the same and fixed it

* Added additional tests for the cli parsing

* Cleaned up the cli tests

* Updated the cargo deny.toml
- Unicode license is allowed under our current whitelist
- Ignoring the time advisory since chrono should not be impacted. chronotope/chrono#602

deny.toml

@@ -13,6 +13,9 @@ vulnerability = "deny"
 unmaintained = "warn"
 yanked = "warn"
 notice = "warn"
+ignore = [
+    "RUSTSEC-2020-0071",
+]
 
 [licenses]
 private = { ignore = true }
@@ -21,6 +24,7 @@ allow = [
     "Apache-2.0",
     "BSD-3-Clause",
     "MIT",
+    "Unicode-DFS-2016",
     "Zlib",
 ]
 copyleft = "deny"