Polish

[hyperupcall]

• woof list (make this work better)
  • Make --all the default if none are supplied on the command line
• Error if give arguments to subcommand that is expecting none
• Allow for passing multiple 'plugins' for each subcommand
• what to do with the prunes? (put them at the bin/woof.sh file)
• Add version metadata to plugins
• think about refactor to use globally variables. $tool_name, $plugin_name, etc. and the like. these values are only mutated in particular places at the start of program execution. makes things easier, maybe will even improve perf due to fewer allocations
• change install_dir/blah to tools_dir because that's what it is