Fixed some tests that would not pass, fixed some shellcheck warnings, used shellformat to format script

[speedythesnail]

• Updated some failing tests (namely the json file tests, which were incorrectly looking for the non-json log file)
• Parameterized the script name instead of running $(basename 0) everywhere
• Parameterized the logfile paths for the regular .log and the json ones (maybe would be useful in the future, probably not)
• Add a test to determine if /var/log/message and /var/log/debug exists, if not, default to using /var/log/syslog (many Linux distros do not have the aforementioned paths anymore, unless you change your syslog config, namely Ubuntu and Linux Mint)
• changed logging function from using printf to just using bash variable substitution (log.sh line 88), presumably there could a be a very slight performance gain by not calling printf
• Change process id from '${$}' to '$$'
• Fixed some issues that shellcheck reports when linting script
• Ran shellformat to cleanup code formatting

I appreciate this logging framework, thank you much!

I apologize for the massive diff due to running shellformat. It's a great plugin that I use to keep all my scripts clean and tidy.